Didn't the last episode on Sunday move towards a possible solution with the introduction of Abraham? Apparently they are on their way to Washington, D.C. because they know what caused the undead and how to solve it?
Darryl will not be killed off. He is the only reason any women watch the show to begin with. Obviously, I could be wrong, but he is a main reason why the Walking Dead has such high ratings, he is pretty much by far the favorite character of many viewers. I particularly wouldn't mind seeing Carl get eaten by zombies, he is such a little brat and has no respect.