If ti had the 3rd party support it would eb around 20 million untis thus far.

Third parties are struggling enough with just ps4 and xbone, with higher development costs there will probably not even have room for both in a few years. And Nintendo would shoot themselves on the foot if their software got a lot of competitors while not getting much more userbase like most here expects.

Probably not, with a few exceptions multiplats have never been a major selling force for Nintendo.

It may have had a million or so more Wii U's sold to date, but really wouldn't have made much of a difference. The system got third party support during the launch months and many developers pulled all future support because none of the games sold. Some of the developers supported the console longer than others, but even Ubisoft who stuck it out the longest completely dropped support eventually.

Third party support isn't going to help Nintendo sell more consoles because Nintendo isn't the brand most gamers care about any longer. The Gamecube had a lot of third party exclusives and shared a lot of third party multiconsole releases with the Xbox, still sold worse with Xbox having practically no support in Japan and it was the first console Microsoft has ever launched.

No, 3rd party is an issue not the issue. It probably would have reached gamecube sales, which would be a huge improvement given the Wii u's sales

Really Competed with PS4 no, Xone perhaps, it sure as hell would sold better. Let's see the Wii U had a different name, normal controller and a 300 bug pricetag including one game would have sold at least 30 million, given there would be more third party support and a steady output of first party games.

It would be definitely be selling better than what it is now.
Compete with the PS4? No way in hell.

If it would have had the same power as Xbox One or PS4, full third party support AND boxed with the pro controller along with Nintendo IP? It would have steamrolled the competition.

They would still have a significant issue with marketing, which is arguably even more important than price point. I mean look at Apple, they don't give a fuck about prices, cause their marketting is so good that people will pay them whatever they want. Look at Beats, look at McDonalds. Its all Marketting.

Yes it would've been able to compete better with the PS4 ...

Despite the issues with Nintendo's brand image, consumers wouldn't preclude another option that wasn't deficient of software since it would've been a viable alternative to those systems ...

In many cases where the PS2 was at a disadvantage compared to Xbox when it came to multiplats that didn't stop the games from succeeding on the former so I'm not convinced that technically inferior versions of multiplats would've massively swayed purchasing decisions ...

All this "what if" exercise is useless since that boat has long sailed ...