But I'm positive N64/GameCube didn't have a gyroscopes, so since they were introduced Nintendo used them as a Gimmik as well as other features like pointing to the screen and tapping on the gamepad...

Zelda U has been rumored to be the biggest, most ambitious title from Nintendo yet regarding budget and manpower; I'd be very surprised if it wasn't an NX launch title.  And I think it's definitely their best move as long as WiiU still gets the game as promised.

Still, strictly business speaking Mario games net over twice the profit and cost less than half to make. Porting a Mario game would earn you much more profit than porting a Zelda game. 

Why wouldn't porting New Super Mario Wii U be a better move? It hystorically sells more copies per console than LoZ per same console in every single occassion.

It's also likely that Nintendo will recycle other Wii U games to push the NX. The Wii U's userbase is so low that introducing these games as 'new' to the handheld audience could recupe a lot of costs and expand the software for the NX easier.

I think there's a difference that some games benefit greatly from the install base without really driving hardware sales (2D Mario games) , while other games benefit less, but are capable of moving a big number of hardware units that games like 2D Mario can't move (Zelda, Metroid).

I honestly doubt there's many people out there that will go like "OMG, a 2D Mario, I have to buy this console". But people will buy a 2D Mario if they already have the console. On the other hand a Zelda or Metroid is a game that many people may consider getting a console for. And then they'll get that 2D Mario

I don't think 2D Mario is capable of driving hardware adoption the way a Mario Kart, Zelda, Metroid or Smash can.

NX will get both Zelda and Mario early on IMO.

Having both early on will ensure decent sales for the first 6-7 months and get Nintendo fans on board who always sit around and say "well I'm going to wait until the big Nintendo franchises come". Well ok, Nintendo needs you to come on board more quickly than that.

The market is tough enough for Nintendo right now, the fastest start they can get off to the better. It will cause other third parties to jump on board early.

But NSMBU was pretty much the only reason to get a Wii U early on (especially if we are talking about 1st party games) and sold better and moved more hardware than WWHD. I mean a port is a port right? Windwaker was open world, it is one of the only 1080p games on Wii U, It has an AMAZING art style that is new and can only be refered to as "toon link" art style, and so few people had the GC AND bought the game (4.6 mil) that you think it would push some sales.... But it didn't.

You could also talk about Twilight Princess, but the facts are it released on the Wii, which is why it sold so well. It was then released a full month later on the GC to abysmal sales (in comparison, still over a million seller). So if it releases on Wii U first, then goes on to the NX.... 

Personally, I completely agree with you. I even said in the past that LoZ, Metroid, ect are games people get systems for, and Mario Kart is the game people who own the system buys, but it's funny to hear all these people say that LoZ shouldn't release as an exclusive to Wii U due to it's poor sales, in which I say people would buy the console for it. Yet again talking about finances, they could drop the price of the Wii U, come with a LoZ limited edition bundle, add in some amiibo and be perfectly fine financially. 

*Edit* Oh, and Twilight Princess and to a lesser extent WWHD are prime examples of mutli release cannibalization. Just a thought...

No because the built off NX is nothing like wii u built IMO so they won't be able to port over the same engine if that makes sense

I'm going with the assumption that NX's launch will coincide with the launch of WiiU's Zelda, very similar to TP.  Under those conditions, the debut of a brand new Zelda on Nintendo's brand new system would be huge, despite the game also being available on WiiU.  

By comparison, a port of NSMBU would do almost nothing to drive the launch of NX, but I'd fully expect it and plenty of other WiiU games to arrive digitally on NX eventually.