The endgame of Walking Dead
is punctuated equilibrium. A new Human species will evolve in response to the Zombie Apocalypse-- a species that eats Zombies. Yum.
I actually thought that's what the helicopter was doing and it was going to be 'herding' the zombie herds by leading them to giant trenches or off of a cliff. If you dug out some really deep and long trenches and then used noise to draw a herd towards them you could just collect them that way and then just burn the bodies.
Yeah, the zombies should be pretty easy to "Pied Piper." I don't know why they don't try it.