The 8-month reservation window is a SVN rule and as such that only applies to the units in a Voluntary resort that is available for SVN usage.
Assume ten years from now Westin Lagunamar Cancun has a 50% turnover and is still a "Voluntary" resort; These new owners are not in SVN and therefore half these units are not available in the SVN pool. At the 8-month window, SVN members from other resorts will have to fight over whatever was left out of the 50% remaining units.
I dislike Starwood for destroying the resale values of voluntary resorts; I know that they lost a sale from us because they made Princeville a voluntary resort; of course they do not care at this point in time because their sales are still booming
But does Starwood keep track of the units that were reserved by non-SVN members vs. SVN members? In other words, if only 50% of the owners at a non-mandatory resort are members of SVN, and at 8 months out, there are 2 units available for a specific week, I would think an SVN member could still reserve that week after 8 months, even if all the other units for that particular week had been reserved by SVN members who owned at the resort. Trying to track which weeks/units had been reserved by SVN owner members vs. owner non-SVN members seems almost impossible, particularly because the weeks are for the most part floating weeks at all the resorts being built. Holiday weeks are the main fixed weeks, and there aren't many of these.
Do people think that Starwood would track a season (platinum, gold, silver) within each resort and the percent of units owned in each season by SVN members, and then "shut-down" SVN reservations once the percentage of reservations within a season of SVN owner members hit the percent of owner members?
I don't think that would happen. I think Starwood would allow SVN members to reserve after 8 months out if units were available and then if they filled up and a non-SVN owner tried to reserve a unit, they would just be told that the weeks were all reserved, and the owner should have phoned earlier in the year to make the reservation. Also, within a season, there are often so many weeks that are not as desirable, so at 8 months out, SVN members will all phone up to make reservations, and if an owner calls to make a reservation for a high demand week, they will be told they have to reserve a different week within their season. It just seems to me this will be a non-issue and resales of non-mandatory resorts actually could benefit SVN members because there will be fewer members to compete with.
To explain: in a place like Kauai, if 50% of the owners are resale purchasers at some point, it is true that only 50% of the units there would be available within SVN if they do track numbers of SVN owners and SVN owner reservations from all SVN resorts at Kauai. But there would likely be a lot of January, September, October, November, and December weeks that were not booked up because these are the lowest demand week. The whole year is platinum, so SVN members from other resorts could still probably book March or June or July weeks at 8 months out (particularly since these weeks are toward the front end of the year).
I hope that all made sense...
Edited to add this:
On second thought, if Starwood tried to limit SVN reservations to the number of people who are owners/SVN members at the resort, there is a potential for a big problem for the SVN owners at the resort! Say at a resort where 50% of the ownership is SVN members, and for some reason 1/2 of those owners (25 % of the total membership) did not make reservations early. Along comes October, and through reservations from SVN owners at the resort and 8 month out reservations from SVN members at other resorts, 50% of all inventory for the next year has been reserved at the resort. An SVN owner calls on October 31 for a reservation for the next year (at 12 months out) and is told that the resort has maxed out its SVN use for that year and the person cannot use their week at their home resort - they must try to make a reservation at an alternate SVN resort. The HOAs are going to have a headache no matter what they do if this type of thing starts happening. I think it is far more likely that the Starwood would not create these limits and that if non-SVN owners try to make their reservations beyond 8 months out, they will be told that they waited too long to make a reservation and nothing is available. That, too will cause problems...
One can never predict what will happen in the timesharing world in the future...