Well if the new Mario game actually turns out good instead of a major disappointment like nearly every Nintendo made game of the last 5 years, then I'll get a Wii. I used to really like Nintendo back in the 90s, it wasn't until the Gamecube and how ultimate shitty its Mario and Zelda were that I started to really hate them (well along with connectivity, farming Mario out to 4 billion other companies, pasting Mario characters into every type of game known to man, refusing to accept HD as the future, etc).
I have high hopes for the new Mario and from what I've heard about the demo at the E3, it's going to be outstanding. I'm also really looking forward to Super Smash Bros, Metroid, Dragon Quest: Swords, Super Paper Mario, Wing Island, Kororinpa, Batallion Wars 2, and Bleach.