I'm not sure that frank's view of a "brave new world" is entirely justified. if you look at all the great migrations and colonisations of history, only a small fraction of the "mother" civilisation end up in the colony. if things are good, the rest stay behind, living largely unchanged lives because they were too lazy/scared/poor/unlucky to go. If things are bad, the colonisation/migration is a result of natural disaster or war, and a large number of the original civilisation are dead.

In "Blade Runner", I see an earth that is Half overcrowded, but has large empty holes in it, like a fruit being devoured by insects.

I don't see it as very hopeful that so many people seem to be missing, and the replicants are being brought in to do the work of the people who have gone AWOL.

Remember "Soylent Green"?