Hah. This is a fairly serious thread. I have yet to meet anyone who could use "magic", it's just not a reasonable solution. But these are "semi-magical" zombies, in the sense that perhaps they are animated and directed by means beyond our understanding, and defy our comprehension of science, but they aren't some fairy-tale made-up thing you can just make up an answer to. We'd just be facing something beyond our understanding in the world we actually live in.
Keeping that in mind, I agree that finding the source seems like the only solution. There are going to be countless people who are helpless in the face of the zombies or who will be caught in helpless situations (wake up with a corpse strangling them, and thus have no chance to fight back). Even an old grandmother might become a serious threat if she became a mindless, relentless killing machine. Sure, she's slow and weak, but shoot her fingers off and they're going to crawl into your throat and choke you.
It's the ultimate nightmare, I say! Probably slow and stupid like the classical zombie, but without the easy solution of wacking/shooting it in the head! On the bright side, there has to be a controlling intelligence of some kind. It's not like a headless torso has the ability to sense an enemy or pursue a goal without direction from another source.
Or we could end up with "rage" zombies, who for some reason are so angry they forget how to eat, then we can just let them starve themselves. Neat.
We could ask how to handle Will Smith zombies, but he already showed us. Only travel in daytime and destroy your scent with chemicals. To eliminate threat, follow a lion or deer and see how they survive each night against a horde of semi-intelligent superhumans. Otherwise, find Will Smith and a grenade and use him as a sacrifice.