Not that I don't agree with the general sentiment of your post, but this sentence seems horrifically out of place.  What's the "solid" 3rd party support Vita has gotten?  

In the west, arguably Assassin's Creed, Call of Duty, Need for Speed plus Madden & FIFA.  All games which Wii-U has it in its launch window.  Yes, the Call of Duty & Assassin's Creed were original games, but are you really trying to say that Black Ops Declassified was an example of "solid" 3rd party support?

In Japan, I only really see Persona & Miku (possibly Gundam & Tales of Innocence as well).  None of them even remotely as big an IP as Dragon Quest which Wii-U is again getting in its launch window.

Other than that, it's pretty much just ports.  Which is simply a product of having been on the market for 1 year 2 months instead of just 2 months (i.e. I'm sure Wii-U will have similar levels of "solid 3rd party support" when it's been on the market for a year and two months).

Like I say, it's not that I don't agree with the general sentiment of your post - Wii-U will pick up steam once it gets proper first party titles, and I'm sure it'll overtake Vita at that point.  I just don't really see why you inserted that sentence I quoted.  3rd party support for Vita has been questionable at best and laughable at most, which is arguably the reason it's struggling at the moment.

Gamecube had also Nintendo first party but it sold not well

Somebody already pointed that out to me.

Because we all know that helped a lot the GC

No, NintendoPie, you will sit here, and you will listen to us tell you that Gamecube had Nintendo First Party games but did not sell well over and over as atonement for your post.  Capiche?

What dumb logic. The Wii U got ports of the real games, the PSV watered down versions (not all of them, but certainly true for AC and CoD).

What really speaks against the Vita is that it had a holiday season priced at $/€199 (including a game) and still didn't move many units. The Wii U is a long way off before it reaches such an attractive price point.

I like how you gave a quick answer and then followed it up with a much more thought out and in depth answer.

No. No capiche. Wii U will do better because of Nintendo's First Party. (Because we all know no matter how hard Nintendo may try, those third parties will stay the hell away from Nintendo.)

I feel like you are forgetting that Gamecube had Nintendo's first party but did not sell well.

sh*t... i admit sales did horrible, but best nintendo home console! Had Melee, that game alone rocked!