Would they always need earth to be habitable?
Because if they somehow managed to terraform and colonise another planet like mars, wouldnt they just make earth so uninhabitable that the rest of us would be forced to go where they are? (Prolly as slaves)
Two points worth making :
More like they don’t have the technology to make it as efficient as in the scifi movies.
but they do have enough money and influence to make money useless and enslave humanity, thus making this point moot.