Once we give up our meatbag bodies, a lot of the physics problems go away.
Admittedly, the tech to upload our brains into computers is a ways off, but it doesn't require amazing physics breakthroughs to get there (eg. wormholes, antigravity, FTL travel etc.).
We can send our computer brains off the planet at much higher Gs, not have to worry too much about flight time to other solar systems, and can grow and download back into meatbags at the final destination if we still desire such things.
Title aside, I hate the movie - dude, why didn't you just make multiple backups of yourself?