Tiger Woods...yeah I'm pretty much counting him as dead.
nah j/k give him a few months of practice and he should be good as new. But I do think his days of completely dominating the game are over.
Other people I wish could have continued longer:
Bobby Orr - Forced out of the game at 30, that really sucks. Damn knee injuries.
Mario Lemieux - Cancer costed him 3 of his prime playing years in the late 90's. Other various injuries really fucked him up as well. Only had four 75+ game seasons in his 17 or so years of play. Could have been as good (or better) than Gretzky.
Pavel Bure - Another sad case of injuries. Put up ridiculous numbers when he was healthy.
Gordie Howe - lol j/k he played till he was like 52