I actually had a dream recently about a fighting game with Disney characters, specifically Goofy and Pete. It didn't make a whole lot of sense, being a dream, but it's interesting that someone came up with something similar in their waking life.
I'd buy a Super Smash Bros with Disney characters in a heartbeat. Are you looking forward to this Epic Mickey game?
Epic Mickey looks pretty cool. I don't currently have a Wii, but I'll probably get one at some point.
Personally, I wanted a similar game that Mickey was seen playing in "Runaway Brain" (1995).