I think we need to get out of this mentality that graphical power decides the measure of growth from generation to generation. It's software and the market's reception to that software that decides the direction gaming goes. We have to remember that the Wii isn't even 5 years old but we act like it never existed and never had the amazing market reception it did. If anything, this should silence anyone who claims a piece of hardware won't sell because its graphical prowess.
We also have to realize that hardcore gamers, especially the ranting forum goer, are in the consumer minority. Even if every third party publisher on the planet makes games for the hardcore gamer and puts them solely on 'Playstation 4' and 'Xbox 720' it won't be anywhere near what the expanded market(new consumers), old school core(Atari and NES) and new school core(established consumers of current 'casual' software) can spur any console that supports them can sell at a healthy, growing rate.
That said, I don't think Wii U won't sell because its graphics. I don't think it will sell because of its design philosophy.
Pixel Art can be fun.
