This entire "Getting Rid of the Magic in them" thing, to me, is likely a red herring for the characters to go down.
Largely because it'd negate the previous season's empowerment finale message.
They may be in hiding, but they're ignoring the elephant in the room (IE: why people are gladly accepting things that eat them as friends and hunting slayers. My mind points towards mind control magic on a grand scale, but I haven't seen evidence for it yet and THAT is troubling) for their own temporary saftey. To me, it's so obviously going to bite them in the ass it's kind of pedantic waiting for that to happen.