The protection of a magnetosphere would allow accumulation of a more significant atmosphere and provide some protection for its inhabitants from solar radiation but that doesn’t change the fact that Mars is 52% further from the sun than earth and receives only 44% as much solar energy. It’s an icebox with an average temperature of -80°F. so who’s going to pay the heating bill?
But the bigger problem with any plan to quit earth and go live somewhere else is that it would require a quantity of energy that is unprecedented in human experience just to get the minimum number of people there to create a stable breeding population and create an enduring habitat for them. All 8 billion of us? Fuggedaboudit!
Other than the sun burning out, there’s nothing that could go wrong with the old planet that couldn’t be fixed with less energy than rocketing to and colonizing a new planet. Plans like this are as cost inefficient as draining the swamp next to your house, putting up a windmill to keep it drained, then building a whole new replacement house where the swamp once stood when all that’s wrong with the old house is a leak in the roof.
And we haven’t gone near addressing the adverse consequences to human physiology that would result from living somewhere that only has 38% of earth’s gravity ....
Can’t they just roll it down a hill and then pop the clutch?
They just need some Unobtainium.
Probably easier to create FTL drive and that is most likely impossible.
Oh, I forgot plate tectonics. If you get Mar’s iron core spinning again, that necessarily would make it more energetic. There’d be no way to isolate the extra heat just to the core so it likely would make much of the planet geologically unstable, with potentially disastrous consequences to the inhabitants.