Again, if death weren't a destiny we all shared we can't know what that would change in our culture, our mind sets, etc. Just as one example, how would our views of war change if people no longer died of natural causes?

Btw, saying things like (paraphrasing) "It's good that Einstein died because he really had nothing useful left to contribute" is extremely judgmental. We have no way of knowing how much the realities of our current existence affected his behavior, nor what he would have done by now if he were still alive.