Everybody think about how many years they've been gaming. For sixteen of those years Nintendo has been playing second fiddle to other consoles when it comes to third party support. 16 years.
It's not going to change any time soon.
I think people hope it changes, when it comes to policy and sales issues, and rightfully so. But unless Nintendo were to empower a competent and strong NoA and NoE, and be willing to pay money, play the aggressive PR game, and maybe be willing to take a slight loss, nothing will change, period.
Third parties are far too invested in their own corner of the market, which doesn't include Nintendo, nor does Nintendo proactively attempt to change that. And to be quite honest I can easily see a valid case to be made by many third-parties to calculate they make more than enough money on Xbox3, Ps4 and GFWL, Steam or Origin to not need to justify a WiiU release. And I think taking into account the calculator would probably support that sentiment shows that it's primarily Nintendo that will need to do the majority of the leg work to gain more third-party support, fair or not.
Realistically, I'm of the mind that in the interim considering where we stand now it's projects like P-100 that will yield the best results from third parties. Publishing partnerships, marketing and maybe even development support would do wonders for at least gaining traction for non-Nintendo IP. But then again Nintendo didn't even highlight P-100 at E3, which goes to show they still have their heads up the wrong horse's ass, they are slowing losing sight of what wide consumer appeal means and are confusing it with something else.