The poor Wii support will be why 3rd parties will likely try harder on WiiU. Hedging against the Wii cost these guys dearly: they ended up fighting on a platform that costs more to develop on (HD games in general) with a smaller userbase. If devs had set aside more efforts onto the Wii platform and did not create the 'third party core games on the Wii suck' atmosphere, their financial situation likely would have been a bit better than they are now. I'd absolutely question their business acumen and likely so would shareholders if they try to pull the same thing with the WiiU. The struggle, and then turnaround, of the 3DS should only go to bolster this: Nintendo will do whatever's in their power to keep their system afloat.
And what about the Vita? The only real success it had was through Monster Hunter, and that series is on the 3DS now. Rude awakening for devs that expected MHP to continue on to Vita, but at this point no one should be surprised that a system with essentially its right arm ripped off is struggling.
