You pull out a bottleneck, only to reach another bottleneck. Puts the problem squarely in the realm of myth. Sisyphus rolling a boulder up a hill. Someone blew my mind one day when they suggested that Sisyphus didn't keep rolling the boulder up the hill because of compulsion, he does it because he finds exquisite meaning in it. He knows every crack, every crevice, how to move most efficiently up that hill. This idea moves the problem from mythological to religious. What is heaven and what is hell?
Some wind up burning out, and reverting to a simpler, more primitive form of life. Yours truly has a hard time seeing that as anything more than a rest stop. As humanity connects and we learn more about ourselves, our minds, and our bodies, we'll start unlocking dizzying heights of human achievement. These things will look like self-inflicted torture.
But at the end of the day, humans yearn for one thing, greatness, elevation, perfection. So they'll keep pushing themselves to that next level.