Do you really want to not care about the work you do? It's nice to be able to come home from work and not worry about work, but I wouldn't want to work on something that I wasn't interested in.
Dunno about the OP, but I'm worried about burnout. The road to being "world class" anything is longer than you can imagine, and it'd suck to get 10 years in and suddenly reach the point where I can't do this any more, no matter how much I used to like it, right when I would otherwise be a big success.
It is apparently possible to care about your work and yet still leave it at work - I know a few people that have managed it. I haven't had a whole lot of success myself.
