They've certainly created temporary clubs in other airports. Usually nowhere near as nice, but at least you feel like you're still getting the access you've paid for. I think the CLT B club would struggle to handle even the volume of eligible J class passengers, let alone the general AC members. CLT has been undergoing other renovations for quite some time and it is a busy hub. Perhaps there simply isn't an area they can designate as a spill-over temporary club space.
Perhaps not. But it seems like at the least the B Club could be turned into a glorified take out window, open up a time warp, and the Bistro Bags ride again. It's something, and better than nothing.