Listen, if a person has a queston, no matter how obvious or bizare; it should be answered seriously with all respect. Even so not everyone is a die-hard gamer or knows a whole lot about it. Please respect other users and if you do not have anything nice to say to other users then do not post it.
Not possible. Wii U game discs are a higher capacity format the Wii optical drive can't read.
Even then, Wii U games use HD level processing power the Wii CPU and graphics chip wouldn't be able to handle.
No, but I wish you could. I wish the Wii U was just the GamePad and an add-on chip, like the SNES Super FX chip. The Super FX chip enabled 3D graphics on the SNES. If they made an HD Wii U graphics chip for the regular Wii, that would be nice.