The nazis also drew up plans for deporting Jews to Madagascar, but like you said, determined it was too expensive and would take too long. They also thought it would allow Jews to organize more "backstabbing" and sabotage, since they'd have an official country from where they could threaten Germany.

They were so high on their own supply of propaganda and conspiracy nonsense and it wouldn't surprise me if similar Q Anon conspiracies lead America down a similar path. They'll deport a bunch of Latine people, which won't actually solve any problems, so they'll start assuming Mexico is secretly sending people across the border and back each day to blow up Texan oil fields or some shit.