I wouldn't worry too much. That's exactly like what happened to us at DHHIR several years ago. Somehow MS had accidentally canceled our reservation (we found out as we stood at the front desk to check in) and the resort was sold out. But every day there was a last minute cancelation and we never had to carry through on our threat to drag a mattress out and sleep under the trees in front of the main lodge. Yes, we moved a LOT, and I don't want to repeat it, but it did work out. And the CMs gave us a big box of cookies on the last day for our trouble-even though Florida was to blame for our trouble, not Hilton Head.