Excellent point! My angle on all this is from my DVC usage, and I have 5 home resorts to 'guarantee' that I get the rooms I want. While I don't usually book room categories that are gone right at 11m, most of my room categories don't make it to 7m, either.
I do have some SAP, but even those are for specific rooms that almost always make it to 7m (e.g., CCV Cabins).
And I think your point about a SAP type of owner benefitting from a Trust is also a good answer for
@MerlinandtheMouse's question:
To
@zavandor's point about SAP, a Trust system will benefit guests who are less picky about their accommodations and could de-stress the planning for an owner that would normally be booking a mid-popularity room category.
For example, a family might know they want to visit WDW every year-ish, but don't want to be tied down to a specific resort (or don't have enough experience with the resorts to even know which they want), plus occasional trips to DL and AUL. No longer would the family be buying the only active WDW resort being sold by DVC and then having potentially stressful 7m booking periods for other WDW resorts and DL/AUL trips, all of those could now be booked at 11m (just might not get the most sought after rooms).
From a marketing perspective, a Trust system will go great as every resort is your home resort.
This is especially good for maybe some more controversial resorts they're going to build. What's been announced for CFW is 350 cabins, no variety at all, and that may be unattractive to lock into for a lot of potential buyers. But if they're buying into CFW+a bunch of other options, suddenly that commitment is 'just' financial and not to a specific room. And who knows what else they might build in the future.