Given he was only given two years to live upon his initial diagnosis, I think he more than covered the long run. *nod*
Well, an end is inevitable. (well some will protest for this statement but surely that will end as well.)
Personally, I don't consider Hawking to be a genius. Brilliant, yes. But what he did more than anything was diligently research a topic and then passionately argued for or against it until the rest of the world reached a consensus, to which he would concede if he was on the other side of it.
Newton was even more hard-headed, so was Einstein but not as much. I'd say that classifies as something.