I think this was already mentioned, but I sure can't find it: All you need is enough points to book 2 weekend nights for you to walk a reservation forward.
With the articulated WL policy, once a member has made a multi-day reservation, that room inventory is locked up by them for as long as that member wants to add contigious days to the reservation. The assumption has been that a member calling on Day 1 at 11 months and finding inventory available will book 7 nights. However, if that member only booked 2 nights, that room inventory would still be unavailable to any other member calling for the first time on Day 2. So our 2-day-booking member calls back on Day 2 and cancels Day 1 and uses those points to book Day 3. That member has now walked the reservation forward to Day 2-3.
The risk to using so few points, of course, is that if you fail to call on any day, you have lost your priority. I would personally also want to have enought points to book Day 3 before cancelling Day2 just as a little insurance against MS making an error in executing the cancellation and cancelling both days 1 & 2. The low points member will also have to make more DBD phone calls to "walk" to their preferred date than a memebr with higher points. But it can be done. -- Suzanne