I've beaten NMs before and had several chances to beat a player almost rated 2300, so I think it's safe to assume I could get to 2200 at least. After that it's very hard for me to say, simply because I don't have experience. But I know that I would try extremely hard to get extremely good :)
If I had 100K/year on chess I don't know if I'd spend all my time studying chess. One can study too much. However, I would be very disciplined in my study (I'm not always now; this needs to change!), buy quite a few more chess books, and get to a lot more tournaments. I'd also consider hiring a chess coach, which might help me get better.
I guess if I can make it to 2200 I could make it to 2300. And if I could reach 2300 I could probably reach 2400. And then 2500...and then... World Champion. ;)
I might could barely break 2000, if I really tried. My brain works better with Go than it does with chess. Still, I wouldn't reject the opportunity. Too bad it's just a fantasy.