Buying Wii or Wii U?

I disagree to a certain degree, games that would never have been considered for the Wii seems to be up for Wii U release, like Darksiders 2 and Batman: Arkham City. I am sure the trend will go that way. Less and less game houses develop for one console and that trend will probably continue.
But you do have a point, if you want more serious games and much more advanced hardware/software, you would do well to wait for PS4 or Xbox 720 (?), because they will outclass Wii U in everything except having Nintendos own games.

Zelda games alone usually make Nintendo consoles worth their money, but if they continue to release such tired installments as Skyward Sword, they can keep their stuff.