Geek A person who is single-minded or accomplished in scientific or technical pursuits but is felt to be socially inept.
So why should they inherit the earth? Well that's elementary, dear Watson. If the Geeks are so incredibly single-minded, they will put themselves to anything that is put before them if it is remotely challenging, if only for the pursuit of science!
Zombie apocalypse? Training for this since day one.
Atom-bombs? As long as the power isn't out for too long
Outbreak of a terrible virus? Social ineptness for the win
See? It's all covered. Of course if the earth explodes in a fiery ball of doom, that might pose a small problem in the matter.
I'm not a geek for writing this, am I?