Ask an anthropologist if this is true.
You’re effectively just saying that whatever the status quo is right now, that’s what we naturally gravitate towards.
I think that we would get back to “organized society”, yes. But for different reasons. (Basically: more population density leads to agriculture which leads to food stores which leads to a ruling class that can hoard the food stores which leads to things that can be raided (what’s there to be steal from hunter-gatherers except for slaves?) which leads to competition, and so on.)
This is roughly what I meant to express. Didn’t mean to imply we’d return to where we are now, but ultimately the drive to survive and thrive would bring us back to some kind of organized society.
My core point being that “cavemanship” isn’t some kind of stable state like Kaczynski insists. It’s an ephemeral/unstable state on the way to some higher level organized society that balances tensions.