Wii Sports sold about 4 million in Japan, never bundled.

Bundles were less common in the US after 2010, and basically nonexistent after 2011. From 2011 onward Wii Sports sold around 9.3 million. In 2011, where anyone who wanted to avoid Wii Sports could have done so pretty easily, it outsold Uncharted 3, Skyrim on the 360, or Arkham City on the 360, all released that year. Also outsold all of those games in 2012 and 2013.

In 2014, 7 years after its release and long after any form of bundling, Wii Sports sold over half a million copies. The DS's best selling game, New Super Mario Bros for comparison, which sold 30 million units and released a few months before Wii Sports, sold less than half that in 2014. PS3's best selling game, Uncharted 3, sold less than 1,000 7 years after its release (the Uncharted Collection on PS4 sold about 600K according to this site). Mario Kart Wii sold under 500K after seven years, and that game sold 35 million copies (many bundled). The Xbox 360's best selling game, Kinect Adventures, is a good comparison, because that again raises the bundle issue. Seven years later, Kinect Adventures was selling less 100K, about 1/6 of what Wii Sports was selling. Point is that Wii Sports had significantly better legs than its competitors for best selling console exclusives, and that's after it was no longer bundled. Which seems to suggest it could have been the best selling exclusive, bundled or not. 

And, keep in mind Wii from 2011 on only sold about 20 million units. Wii Sports attach rate was nearly 50%, and nobody was forced to buy it. I worked in retail, and I'm about 99% sure either NSMBWii or Mario Kart were the default bundles after that point. And, to the extent there may have been Wii Sports/Resort bundles temporarily after (which I don't remember happening after 2010) the Mario ones were available, so nobody had to buy Wii Sports. The attach rate certainly would have been higher even without a bundle, for the first few years. 

This is ignoring the fact that Wii Sports was heavily featured in Wii's ad campaign, was featured in media like the Colbert Report, the Academy Awards, Tropic Thunder, Big Bang Theory, and at the Academy Awards. So, either Wii Sports was a legit cultural phenomena in its own, or Nintendo thought Wii Sports was going to convince people to buy it. 

Which of course brings us to the fact that the Wii was sold out from its launch for a year or two. Wii Fit didn't come out till 2008. Seems pretty reasonable to assume that Wii Sports was a huge part of why people wanted the Wii. While the Switch has a lot of games that have sales comparable to BOTW that launched in its first two years, the only other 10 million seller for the Wii (aside from Wii Play) was Mario Galaxy.

So, even if without bundles, Wii Sports would have sold around 10 million from 2011 on, and had a near 50% attach rate after that. Common sense would indicate that based on the sales patterns of virtually every other game, media presence, and the Wii's success without a ton of other huge sellers, that Wii Sports would have sold much more than that from 2006 to 2011 even without bundles. 

90-95% would be an exaggeration (although maybe not a huge one in terms of early adopters). But an estimate that Wii Sports would have sold to 50% of Wii owners seems incredibly reasonable, if not overly conservative. I don't think it's unreasonable to say that it would have sold at least 40 million units without bundles, and 50 million doesn't outlandish. It's clear millions bought the Wii for Wii Sports, and there's a pretty compelling argument that it would be the best selling console exclusive regardless of bundles. And... no offense to Astro's Playroom which seems to be a perfectly fun little pack in, but I don't think anyone seriously things there's a chance it will be nearly as successful.

So what were they all buying the console for? Sure as hell wasn't COD or other Nintendo games for that matter.

Look at WiiU console sales. It had all the big Nintendo franchises and how did that sell without a killer game to sell the concept of the console?

At least 90%-95% of people bought the Wii for Wii Sports. The console was WAY under powered compared to a XBOX 360 / PS3, the name was laughable by gaming stores but the killer game it had in Wii Sports to demonstrate motion controls is what sold the console.

Other consoles don't really have a killer app because they got ever major 3rd party publisher supporting them so they have multiple AAA games that enough people want to buy, hence the good console sales.

Now looking at Switch, why is that doing so well? Well because it is a hybrid, there is no single killer game that makes you want to buy it other than I can connect to TV and play or I can play on the go when I'm on my way to work on public transport etc.

Wii Sports sold about 4 million in Japan, never bundled.

Bundles were less common in the US after 2010, and basically nonexistent after 2011. From 2011 onward Wii Sports sold around 9.3 million. In 2011, where anyone who wanted to avoid Wii Sports could have done so pretty easily, it outsold Uncharted 3, Skyrim on the 360, or Arkham City on the 360, all released that year. Also outsold all of those games in 2012 and 2013.

In 2014, 7 years after its release and long after any form of bundling, Wii Sports sold over half a million copies. The DS's best selling game, New Super Mario Bros for comparison, which sold 30 million units and released a few months before Wii Sports, sold less than half that in 2014. PS3's best selling game, Uncharted 3, sold less than 1,000 7 years after its release (the Uncharted Collection on PS4 sold about 600K according to this site). Mario Kart Wii sold under 500K after seven years, and that game sold 35 million copies (many bundled). The Xbox 360's best selling game, Kinect Adventures, is a good comparison, because that again raises the bundle issue. Seven years later, Kinect Adventures was selling less 100K, about 1/6 of what Wii Sports was selling. Point is that Wii Sports had significantly better legs than its competitors for best selling console exclusives, and that's after it was no longer bundled. Which seems to suggest it could have been the best selling exclusive, bundled or not. 

And, keep in mind Wii from 2011 on only sold about 20 million units. Wii Sports attach rate was nearly 50%, and nobody was forced to buy it. I worked in retail, and I'm about 99% sure either NSMBWii or Mario Kart were the default bundles after that point. And, to the extent there may have been Wii Sports/Resort bundles temporarily after (which I don't remember happening after 2010) the Mario ones were available, so nobody had to buy Wii Sports. The attach rate certainly would have been higher even without a bundle, for the first few years. 

This is ignoring the fact that Wii Sports was heavily featured in Wii's ad campaign, was featured in media like the Colbert Report, the Academy Awards, Tropic Thunder, Big Bang Theory, and at the Academy Awards. So, either Wii Sports was a legit cultural phenomena in its own, or Nintendo thought Wii Sports was going to convince people to buy it. 

Which of course brings us to the fact that the Wii was sold out from its launch for a year or two. Wii Fit didn't come out till 2008. Seems pretty reasonable to assume that Wii Sports was a huge part of why people wanted the Wii. While the Switch has a lot of games that have sales comparable to BOTW that launched in its first two years, the only other 10 million seller for the Wii (aside from Wii Play) was Mario Galaxy.

So, even if without bundles, Wii Sports would have sold around 10 million from 2011 on, and had a near 50% attach rate after that. Common sense would indicate that based on the sales patterns of virtually every other game, media presence, and the Wii's success without a ton of other huge sellers, that Wii Sports would have sold much more than that from 2006 to 2011 even without bundles. 

90-95% would be an exaggeration (although maybe not a huge one in terms of early adopters). But an estimate that Wii Sports would have sold to 50% of Wii owners seems incredibly reasonable, if not overly conservative. I don't think it's unreasonable to say that it would have sold at least 40 million units without bundles, and 50 million doesn't outlandish. It's clear millions bought the Wii for Wii Sports, and there's a pretty compelling argument that it would be the best selling console exclusive regardless of bundles. And... no offense to Astro's Playroom which seems to be a perfectly fun little pack in, but I don't think anyone seriously things there's a chance it will be nearly as successful.

I did exaggerate a bit but I took a simplistic view.

Gamecube sold 23 million units

WiiU sold 14 million units

I would argue the Nintendo core audience is somewhere between these two numbers as Gamecube actually had pretty decent game support from 3rd parties even compared to Wii.

So lets use 20 million to split the two as the core Nintendo base.

Wii sold 102 million units.

Minus the 20 million core base

That is 82 million Wii's sold to non core Nintendo fans. So what the hell did these people buy one for when the PS360 were so much more powerful and had much better 3rd party support?

There are tens of millions that only bought handhelds, and the Switch I think proves that. I think Nintendo's real total base is more like 40-50 million.

We are talking about dedicated home consoles and I don't think the user base is 40-50 million for that, otherwise WiiU would have sold say 30 million (even with the disappointment it was) as it still had the main Nintendo game support. If you look at Japan the 3DS outsold the Wii 2 to 1. 

I also know many Sony, Microsoft and PC friends of mine who always buy a Nintendo handheld, because well it is portable and mainly for Pokemon.

The Switch benefit is even more intensified, as it is more powerful hardware hence why it will outsell the 3DS, meaning even barebone third party support has proven to help sell console. For example a few of my PC mates who don't console game at all, bought the Switch so they can play the Witcher, Doom etc at work in their lunch break lol.

Lol! All i need to say is, read this thread, be enlightened about Wii Sports, open your eyes. It seems that the main thing you were completely ill-informed about was the worldwide phenomenon that wii sports was and possibly still is. Yet you are still trying to compare it with equality to a free app that likely most ps5 consumers won't even know about? Lol indeed!