What’s that shambling over the curb toward the local theater? No, behind the vampires. Could it be a stampede of the undead about to take over Hollywood? AMC’s new drama series “The Walking Dead” debuts on Halloween, and more than a half-dozen zombie-related feature projects are on their way to theaters — including Friday’s “Resident Evil: Afterlife” — or in development at the studios. With this many flesh-rotting grave-jumpers on tap, could zombies be making a stab at the pop culture crown? Do zombies got the right stuff?