If You Can Get into Space, You Really, Really Should
Look, a ruined world is no place to live. Just because you can survive doesn't mean you should. If you have the chance to jump on a rocket ship and hightail it out of there before the roving highway gangs kill you and make a parka out of your skin, you should probably take advantage of the opportunity.
Exciting career opportunities await you across the Milky Way! You could oversee and protect Earth's last remaining plant life on board a space station (Silent Running)! You could grow fat and complacent while robots clean up the planet (WALL-E)! All of the cool people go to space: both Oblivion and the upcoming After Earth feature major movie stars making a living away from a ruined Earth.