Nintendo does not need a graphical successor to the U

[Xenostar]

Nintendo games certainly don't, they have a cartoony style that works and doesnt need loads of power, but most 3rd parties like to do more photo realistic stuff and thus need way more texture memory and shader effects. Power is what will stop 3rd parties making games for Wii U a year from now when the PS3 360 games are drying up, there will be no multiplatform games coming to Wii U. Nintendo need to convince 3rd parties to make exclusives for them, or to go multiplatform with games on weaker hardware like the Vita and 3DS.