So I see two possibilities as regarding the end of afbb or at least the curbing of it:

  1. The collapse of western socialism and therefore no more financial support for single mothers, therefore women will essentially have to go for beta male providers (many of whom will not be up to par genetically)

  2. Cybernetics and other looksmaxing technology. Eventually medical technology will catch up to the point where any hopeless beta bux can "ascend" into some gigachad (given he has enough money) and therefore it will be nearly impossible for women to tell which men have good genes and which ones don't practically making sexual selection obsolete.