Agree, there are also an incredibly huge number of bodies out there to colonize for resources, and the possibility of Aliens coming over to colonize us while we're still stuck on this planet are incredibly remote. Honestly, I think if you do have the tech to get to earth, it's vastly easier to extract your <insert energy source> from the N number of planets out there.

If he's talking about space opera however, that _might_ be possible, but honestly I'm not even sure if we can get off the rock before we destroy ourselves, but yes, that is a possibility.