3rd parties aren`t ruining Wii U.
Wii U had a lot of ports on it`s launch. but so will PS4 and Xbox 3 have a lot of ports.
both consoles might have one or two 3rd party exclusives that matter, but for the most part it will be 1st party games that will stand out. And unfortunately, Nintendo repeated 3DS' mistakes, despite knowing in advance what that would lead too.
Having the big 3rd party exclusives and having all 3rd party games won`t make a difference on either consoles. Actually, it`s better that Nintendo loses on ports now. Because now, they have the time and opportunity to release a good number of 1st party games and lift sales - which is what 3rd parties want to see happen before they decide to take risks.
When PS4 and Xbox 3 come out, not only they will have go head to head with a few exclusives to stand out, but they will have to face Nintendo at November and December, with probably all of the big 3rd party exclusives and great 1st party/exclusive games already out: Lego, MH 3, Pikmin 3, Yoshi, WW HD, Mario Kart or Mario 3D, Wonderful 101. Not to mention they will have to fight against PS3 and Xbox 360: with whom they will share most of their launch line-up, without significant graphical and content changes.
We have to have patience!