Civilization is ultimately a success, so it is Cultural Marxism bringing it down, not saving it.
Civilization is the only solution for long term evolution. I believe our society will have to evolve in the coming century to something more sustainable, else we go to war until our numbers are down. Honestly, I see the latter. Our technology gains will still be held onto by at least a few, and we will progress on. One day we may find a way off this rock. We will die if we are a failed civilization, but we will die whether the tribal idea succeeds or fails.
I don't see anything wrong with that future. Survival has always been for the strong. If we weren't at war as a country, we would be at war as tribes. Luckily, modern warfare is far less vicious.