@mosc, that could be, but wouldn't bet on it. Right now, Dylan is more famous and perhaps even has more prestige than the Nobel prize for literature. But I doubt that will last.
After all, the Nobel prize for literature gets a lot of prestige from its association with the the science prizes - that's what sets it apart from a myriad of other literature prizes. And while I don't know about a 100 years, I do expect that the science prizes will stay very prestigious for at least several decades to come.
Dylan's hardcore fan base, on the other hand, is going to die off in those same decades. People who went to his shows, anticipated his albums, for whom he is a nostalgic figure form their youth. It seems unavoidable that his mass fame is going to diminish. Not disappear, just grow less.