Sounds like the plot from Revenge Of The Nerds. Very unlikely because of the same problem as before: the ability to attract females correlates with the skills

Sounds like the plot from Revenge Of The Nerds. Very unlikely because of the same problem as before: the ability to attract females correlates with the skills needed to start a successful new tribe that can compete with the old. The only way I see to save the argument is to say that the "losers" who left, or were more likely pushed out, stumbled upon some favorable ecology, maybe they stumbled into modern day Europe. But then you're back to geographical determinism and so many things changed in society as agriculture developed that singling out male envy as the cause of monogamy requires more evidence than I think you have.