I don't really know if I'd actually want to play Diablo 3 on my 360. Maybe, if the controls could be mapped well. It'll probably end up working better on PC though, so I'll probably just end up getting it for that.
That being said, I really do believe a game that is very similar to the Diablo games could end up being quite excellent, perhaps even better for those of us that prefer comfort in our gaming. Sadly I do not know of any console games that are both similar to Diablo and... you know, good. The closest I can think of is maybe the Dark Cloud games... Dammit, now I want to play Dark Cloud. I wish I knew what happened to my copy.
Anyway, short version: The idea has a lot of potential, but I'm dubious of porting Diablo. Still, I very much like the idea, so I said yes even though that's kind of a lie.