My guess is with Earth already getting over populated, not near fully but getting, in the next 5-600 years when were all gone and done etc, they will figure out someway to revive mars or
something and make it so people can live on it.
Then we'll have all the same watermelon on there we got here, we'll see a mcdonalds with a sign out front, "First Mcdonalds On Mars!" and lil Ronald will be out there shaking lil Green mens hands good stuff.