I would also be concerned about the possibility of not being able to bank the excess points from the "downsizing". Other than Premier Season, there is about a 60-80 point difference betwwen the 2 bdrm and the 1 bdrm for one weeks stay.
If those points were borrowed from your next use year, or if you are past your banking deadline when you downsize, it may be use it or lose it time.
My two cents, Steve