Possible? Yes. Likely? Not very. That's a busy time of year for the Florida routes, and the seats have been for sale for a while now. You might get a really early morning flight go on sale, or a flight to FL late on Friday night or late Saturday.
Last year we did get Dings for the 8th-11th of December from STL; I think the fares were $69 + tax. We bought them no later than mid-October, though.