Not to geek out on you or anything, but Leonard's with Penny. Sheldon is dating Amy.
Neither are Snow White, the elaborate murders on CSI, or the Wildings from beyond The Wall. In real life Sheldon would never end up with Penny, and an office that was really run like The Office would fail miserably. High school Glee clubs aren't stocked with beautiful 20 somethings with broadway calibur voices who have the moves like Jagger.
No tv drama or sitcom is truly based in reality. If it was, why would we watch? The Walking Dead isn't really even about the zombies. It's the struggle of a group of survivors to fight to stay alive and sane in an insane world.
If you want to get down to reality, no, the zombies aren't coming. However, you can really substitute anything for the zombies. Earthquakes, floods, hurricanes, tornados, world wars, any disaster that completely alters life as we know it.
Again yiu didnt even answer the question.
Its stupid. Zombies arent coming.
The Walking Dead is the best show on television. Period.