His last year was in 1973 and he was playing against Kareem, Nate Thurmond, Dave Cowens and Wes Unseld. He still had the highest True Shooting % in the league. He had the third highest Offensive win Shares as well as the third highest Defensive Win Shares in the league.
I have to agree with p00ka, that it is pretty hard to translate #'s from one era to another. It's just hat chamberlain was a total phenom. No player has dominated during his career the way that Wilt did, and so far, having watched him play (though infrequently given TV coverage limitations back then) I haven't seen a player come close; not Jordan, not Kobe, not James, no one. Taking nothing away from those three players, but there is no comparison.
Having said all that, I doubt that Chamberlain would dominate as completely today, because the NBA draws form all over the world, and back then it was pretty much strictly a US of A party. Bigger talent pool in todays world. And I think Wilt was such a physical specimen that modern training and coaching would have only made incremental improvements in his game, whereas I think it can have a larger impact on people who aren't complete freaks of nature, so the performance gap between him and other players would have been less. But still...It sure would be interesting to see him in todays game, with current training methods and coaching. I wonder what Popovich could have done with a player like a modern version of Wilt.