The always-on cloud future, welcome everybody! This is going to happen more and more.
Between this and the massive disappointment that Diablo 3 was for me, I think I'm just done with Blizzard for a while. My company phone doesn't support their authenticator (it's a BlackBerry that's actually too new) and there's no way I'm paying for an authenticator just because they can't keep their crap secure. I'd sooner just shut off my Battle.net account entirely.