There's a problem, however: The "Tribal living" we're speaking of has a 0% chance of: Curing disease Defeating aging Preventing mass-extinction from a super

There's a problem, however: The "Tribal living" we're speaking of has a 0% chance of: Curing disease Defeating aging Preventing mass-extinction from a supervolcano or asteroid impact Leaving the planet before the sun envelops it Of course, we might not do all of that either. We might get killed by nukes, or climate change. Some of it might not be possible even without those issues. If you want the human race to continue on, a post-tribal lifestyle is the only way it is remotely possible. It isn't assured - but we know the chance of it happening with tribal living is 0.