Up until very recently evolution has been selecting in favor of intelligence. Otherwise we wouldn't have it. As for the claim that the dumb are out-reproducing

Up until very recently evolution has been selecting in favor of intelligence. Otherwise we wouldn't have it. As for the claim that the dumb are out-reproducing the smart now; well, I'd say that's a consequence of smart people desiring to invest more in their kids, but it doesn't have to be that way in a different societal environment. In particular, I can't see free reproduction and globalizing civilization co-existing for many generations longer.