Bobby Fischer against the world

Hello everyone. I was watching the Bobby Fischer documentary a few days ago with my 10 year old son and he asked me a really good question. He said "Dad, do you think Bobby Fischer would still be someone to fear in the chess world?" I have to admit that I was not expecting that type of question from him. I later began to wonder what would the chess scene be like if Bobby was still actively playing.I began to do a little reading and learned that many of the chess greats played pretty much all the way to their death beds. Given that Bobby died at 64 I was thinking about what deeper impact he would have on the game today versus what he had during the '60s and '70s (had he not lost his mind ofcourse). What great things would he have done had he not dissapeared for so long. I then began to ask myself if Bobby would have defeated the new Komodo 10. I would love to have spent five minutes in the mind of Bobby Fischer during a Simul. 

No player in history has the ability to defeat Komodo 10 (rated over 3300 elo). I also have been interested as to if Karpov would have ever become world champion had Fischer not quit. Some people may think that's ridiculous, but considering Karpov never broke Fischer's rating record and Fischer was probably better than his rating implied, it's not hard to see maybe he would hold on to it long enough until Kasparov came along and Fischer began to naturally decline the title would switch. As for him being someone to fear if he were still alive, he would in the sense of he would still easily be of GM strength, but certainly the top players could handle him.