How about WiiU 2.0? Should Nintendo start over? Nintendo can put out a new console that could have better CPU/GPU than PS4/Xbox1 but potentially at similar price if Nintendo decides to put a new console out within the next year or 2. Considering that PS4/Xbox1 started development few years ago, if Nintendo starts development for a new console now, Nintendo can get similar parts for cheaper or better parts at same price.
I suppose Nintendo would piss off the customers that just bought a WiiU, but there are ONLY 6 million (at a pace to sell 20 million lifetime) that has bought a WiiU so that's not that many people. Although Nintendo would be about a year or 2 behind PS4/Xbox1, they can potentially sell 80+ consoles if they can put a powerful but affordable console that has great 1st party exclusive (a given for Nintendo) with great 3rd party support (that can potentially be better than PS4/Xbox1 versions).