This is a great way to eliminate the day-by-day phone calls to MS at 11 and 7 months ... however ... it adds a potential for abuse if members really want a 5 night reservation (Sun - Thurs) but can now call to reserve 7 nights (Friday - Thurs) and then later cancel the Fri/Sat - thus getting a 2 day booking advantage over those who wait until the Sunday may be reserved.
If that's the case, MS may need to have a policy where later modifications where the check-in date is dropped from the reservation would require that the reservation would be cancelled and rebooked - allowing the waitlist to pick up any freed up dates in the meantime.
It will be interesting to see how this works as time goes by. In principal, it's a great way to reduce phone calls for MS and headaches for members. There is certainly the potential for someone to call for a hard-to-get reservation, be the first one thru at 9:00am and have no availability already because that date was already reserved 2 days ago.
Stay Tuned!