Natural selection only works if the organism is allowed to die. I think the same is true for institutions and the cultural elite. Part of the stagnation, if you buy it's existence, is a slowing of the rate of death of institutions. I partially buy these arguments but life extension is such a stupid non-goal because it'll only calcify the elite leadership important institutions.

Within a year or two we will have an AI ethics governing body whose members may live to 150. I find that concerning