From the ancient times up to now, we’re still in love with the idea.

Photo from Lindsey Turner’s Flickr
Stories about zombies are rampant. I first learnt of it in the traditional story telling during Halloween season. Now, seasons after seasons of TV shows are featuring zombies. The end of the Twilight Saga, whether you accept it or not, will be a blockbuster in a few weeks. Gamers will kill off zombies again in the new Resident Evil 6. Even songs and commercials are inflicted by the zombie virus.
Why do we love it?
Hollywood can produce movies where we don’t have to use our imaginations. What we watch in movies is extremely believable. In the top 10 bestselling horror movie franchises, Texas Chainsaw Massacre rounded the 10th position with $364 million, and while the Exorcist notched the top 1 with $2.3 billion. This meant people wanted to be scared (for a while). These people wanted to see gore. This stuff is wicked cool.
The zombie idea is interesting. We wanted to know how humans would fare against the dead. There are different stories that can be created around it. I’m sure you’ve seen one where the character saw a zombie close friend (or family). Would he shoot in the head or let the zombie kill him?
Aside from an array of possible stories, zombies won’t die out because there are rooms for variations. Zombies are supposed to be dead, only the virus controls the body to disseminate terror. But now, they can have emotional memory: the zombie close friend can stop himself from attacking, hinting the main character to run because he doesn’t want to hurt.
Among the weak points of being a zombie is the sluggishness. You’ll be easy to snipe and run from. But Edward’s flashy. The witch in Left 4 dead Xbox game will chase you.
Zombies are ugly and bloody. But the bulk of the dread comes from their ability to transform you into another and well produced sound effects. See this, they can be funny as well like this zombie in Starburst commercial.
People can play around the idea of undead and be lucrative in selling it. So zombies will remain still.
Should we have more zombie stories or do we need to move on?
Source:Happy Halloween: Top Ten Best Selling Horror Movie Franchises Of All Time; Bossip