It's good that Nintendo acknowledges the importance of a strong 1st party lineup, but the fact is, even if Nintendo busts their ass and goes all out, releasing tons of great 1st party games, there are still going to be lull periods where the development teams are stretched too thin, busy on 3DS software, tied up with bigger projects, etc. This is when third parties NEED to step in. If they don't, we're simply going to be looking at another N64, Gamecube, and (to an extent), Wii library where there are brief periods of plentiful quality games dispersed amongst long periods of droughts. Nintendo doesn't have the sheer numbers or manpower that Sony's studio has, and unless they intend to seriously upgrade, third parties are key to fill in the gaps.
This is on Nintendo to push for their support. I don't care how much third parties hate you, or how much they hated Wii, or their fear of their titles getting crushed by Nintendo games. You do EVERYTHING in your power to get more plentiful, and more importantly, more QUALITY third party games. Buy studios, offer money, push advertising, work closely with studios, make development as easy as possible on your platform. Hell, buy them a steak and lobster dinner if that's what it takes. Wii U NEEDS stronger third party support, or I fear the Wii sales numbers will be the absolute ceiling for Wii U success, and more likely than not, an unreachable goal.
While Wii at least got the quantity of third party games unlike the N64 and Gamecube, it was lacking in the quality. Wii U will need both in order to have the surge of success Wii had, along with the greater longevity of the HD consoles.