Your theory is very clever but has three major issues :
- PRICE : if Nintendo comes up with such advanced/complicated technology as home/portable hybrid, it's probably going to be quite expensive as Ipad or Surface are. PS4 and X1 will have room for a price cut by end of 2016, which will be a huge entry barrier for Nintendo's "return".
- PERFORMANCE : an hybrid system is not gonna have PS4 or X1 level of graphics, which will make it unattractive as next-gen games keep getting sharper. At best, it will be some kind of super-powerful Vita, which will face Vita's current problems and competition.
- TRUST : Nintendo has lost the trust of gamers and developers. Why would developers restart from scratch when they already earn nothing on a 8m WiiU userbase? Why would gamers uninterested in WiiU suddenly want to play Nintendo games on that new platform?










