Nintendo can't go head up in a console arms race with companies who are willing to lose billions on game consoles on the front end. Sony and Microsoft are not gaming companies they just have gaming divisions of a larger company. Nintendo doesn't make the operating system in your PC or your next TV or digital camera. All Nintendo does is make games so loosing billions on games and having other divisions of the company bail your ass out of the fire is not an option.
from that standpoint Nintendo tried to innovate and develop ideas that didn't cost as much and set them apart from their competition. the problem with the Wii U is it was forced to launch ahead of the other consoles because its weaker and because if it came out with them they would steal it's thunder. the software isn't there right now. its like the Playstation Vita in some respects but its actually better off because at some point the Wii U will get software that sells systems. the Vita is something Sony will have to carry alone and their arms aren't that strong.
Well, if these developers move onto Unreal Engine 4 and the WiiU is still on UE3, where will games come from?