I think there is plenty of risk with this if you're booking for Christmas, Thanksgiving, F&W, or any other holidays or special events, but if the reservation is in an easy to secure resort and villa size (1 or 2 bedroom) I wouldn't think there would be a problem. With these factors, it would just seem easier to me to book at 7 months because you're still on the same playing field as everyone else who owns at another resort than where you are booking