to be of no consequence.
I realize the scenario is hilariously ambiguous, raising such questions as;
How much metal and other resource is required to construct your terrestrial base, and how much space is required to house 100 million martians? Not to mention a martian industrial complex capable of processing and constructing thier way of life which is also undefinable.
Will human rebellion be inevitable and possibly our destruction?
If you required an area the size of Europe, where do the displaced people go?
EDIT: That last question is abit moot, since were gonna be camping 100 million martians next to spongebob