Yeah, this goes beyond "shit happens" in my book. At the same time, if the gig had been canceled it'd be a bit more understandable for some reason. Kind of odd, honestly. For my part that's probably how I'd view this; show got canceled. It does suck for people who are on the fence, though, not knowing where they'll be re-ticketed to before the cancel date.
Two things I'd suggest: One is that an actual cancellation may well be in the cards. My hunch is that a whole lot of people opt out of driving an hour+ to see them on a week night. PA is one of those places I don't fully understand, I find it rather peculiar, but the new place does look to be out in the boonies, so they're not actually adding any people, and they're losing plenty. Second is that if it doesn't get cancelled, people's seats may well be upgraded due to a lack of sales. This might wind up being a pretty intimate show with a tiny crowd if they actually go through with it.