They are already zombie survival guides, zombie TV shows, zombie games (You'd be hard pressed to find a game series without zombies going back 30 years. I bet there's even a zombie Tetris, or even a zombie checkers). They are already proliferated into popculture, so you can't remove them now. Sorry.
Is it overused? Yes. Do I enjoy zombie/infected culture? Yes.
I don't think it should but it can be funny if done right. There was a game (forget which one )where the Austrailian version had rainbows instead of blood/gore come out of injuries zombies received. I'm sure not too many Australians who played the game felt that way though.