It certainly could happen in 30 years. We could make it happen much faster if we got a genocidal dictator who decided to kill smart people. Pol Pot may qualify.

It certainly could happen in 30 years. We could make it happen much faster if we got a genocidal dictator who decided to kill smart people. Pol Pot may qualify. Birth control is currently the primary natural selection criteria. Anything that can defeat birth control is extremely strongly favored by evolution. Evolution is quite rapid when the selection effects are strong, especially when also starting from a diverse population.