Good luck getting the world into situation #2 since it's impossible to see Western creators of the tech getting poor and West-hostile societies on board. Though

Good luck getting the world into situation #2 since it's impossible to see Western creators of the tech getting poor and West-hostile societies on board. Though I think somewhere about 250 MM people is the best density myself and would be best even with current spans. Billionaires wiping out the poor would incite a vigorous class war.