There are a number of obstacles between where we are and a world where intelligence is taken as seriously as it should be. See most other comments around here

There are a number of obstacles between where we are and a world where intelligence is taken as seriously as it should be. See most other comments around here though; the reason IQ is not used more often is that intelligence denialism is rampant. One reason is that as some comments demonstrate, egalitarianism and democratic principles are incompatible with IQ realism. It's pretty clear that intelligence segregation is going to turn out in practice to be racial segregation, so it's simply not going to happen in a society that has defined itself against such practice.