interesting comparison
I think if Dimitrov played in the same sort of time period as Ginepri then, yes, probably it could happen. well maybe. what Grigor has in his favor is that the upcoming youngsters don't appear to be that great. Robby didn't have that, he had physical issues and injuries and a large crop of great players to contend with (even other extremely solid Americans like Roddick and Blake and Fish)
Ginepri highly underrated. great ballstriker when he was at his best, which unfortunately wasn't very long.
the thing is though, Ginepri was plagued with injuries in his career. I doubt the same will happen to Dimitrov so undoubtedly he will soar to bigger/taller heights than Robby was capable of