I think that would be pretty close to a miracle. Although I was talking to a couple yesterday here at HHI and they got a GV here off the waitlist at less than 4 weeks out. There are only 5 GV's here at HHI. So anything is possible.
You usually have more luck on the weekends than weekdays.
I remember when they first built Vero Beach, my family took a tour during the construction, and I saw the plans for phases II and III. Shame they were never built, at least phase II, would have added a few more beach cottages.