I think you are right about producing enough high iq people to advance technology as fast as possible the last century or two. And the west formed meritocracies humans never had before, that still retained elite control mechanisms. All this sped up our technology development. However, now they will not longer need or desire a population with a decent iq. They want to mix us into eurasian-african mongrels with no ancestral culture, that will be slaves that are easy to control. I think they want us in the 70-90 iq range. Of course there will be elite who do not mix with the slaves and are far more intelligent.