Depends on how the gameplay works really. I found undead to be boring because it was just boring "shoot the zombies before they get too close." If GTAV goes the alien invasion DLC route, at least they might be more inventive with stuff.
LittleBigPockets: A study of the video game LittleBigPlanet and the odd things that children create on it. http://littlebigpockets.blogspot.com.au/