Mainly because people in power die off. There are many ways to solve this including pushing people out of power after they have been there for some period of ti

Mainly because people in power die off. There are many ways to solve this including pushing people out of power after they have been there for some period of time. Example, 50 year tenure limit for professors after which they can't be professors any more or they're forced out to a different industry. Similar for politicians, etc.