A slowdown of progress becomes as irrelevant as the passage of time. You'd experience more net progress anyways.

Regardless, it's still not a reason to die. You could argue that progress is meaningless with death.

Finally, progress being slowed down is something we can solve independently of death. I think it's a good idea to find alternative solutions to stagnation than literally dying - that's like solving an issue with your OS by throwing your whole computer in the trash.

Alternatively phrased, if power was already stagnated and concentrated, and you had a button to start killing a couple million random people like clockwork every year to "solve" this problem, it would be insane to press it.

Literally the end of evolution.

Evolution is already mostly over, and on the timescales that it becomes relevant we will have engineered ourselves far beyond our flesh shells.

s/evolution/engineering and life goes on