That could be a real nice game changer, if you look at Nintendo's games for 3DS and Wii U and combined all those games onto one platform it would make a big difference I would think.
The other thing is Nintendo could take more chances with new IP or bringing back older IP because they wouldn't be bogged down by having to develop 2 versions of each major franchise for two different systems. So you know, EAD Tokyo could make one 3D Mario game, but then be free to do something else instead of having to do 3D Land and then 3D World for instance.
Maybe with more freed up development resources as a result Nintendo can take more chances making new IP like Splatoon in the future or bring back older IP like Wave Race.
The more I think about it, the more I think it's a pretty good idea. I don't really need to have a Mario 3D Land, when 3D World is a better game in most every respect for instance, but that ties up the development team for a good 4 years or so and prevents them from giving me something different. Thoughts?