Hitler wasn't dictating at the time of his death, but Stalin was. Stalin's death lead to a good change. When somebody stay in power for too long it leads to s

Hitler wasn't dictating at the time of his death, but Stalin was. Stalin's death lead to a good change. When somebody stay in power for too long it leads to stagnation. Human civilization has other measures against such stagnation (such as 2 terms limit for presidential position). However limited life span still adds extra protection against society stagnation. It's not obvious if benefits of unlimited lifespan outweight potential problems. I think that doubling life span would probably be beneficial overall, but it's hard to say if further life span increase would.