I own an MVCI developer week (platinum Ocean Pointe), a privately purchased Marriott Grande Ocean week, and assorted non-Marriott weeks.
I have read through all the Destinations Club documents, and the main conclusion I have drawn is that the new system is neither inherently good nor evil with respect to current owners. Everything depends on the specific needs and interests of a particular owner.
For example, someone who is happy with the current system is under no obligation to join the Club. One of the much maligned features of the club is the point credit given when one enrolls a week in the club, and the higher number of points needed to reserve the week. While this sounds incredibly evil, it probably helps the existing owner who stays with the old system.
As a point of reference, my week is worth 4325 points. I can reserve any week in the Jan to April time frame according to the current and continuing system. However, a point user wishing to reserve a week in February or March has to pay 6000 points, or so, 7300 for the prime President's Day week. These higher prices are certainly likely to dampen the rush of point owners to reserve those prime weeks. Incidentally, prime weeks will only be available to the extent that owners of those weeks join the club.
There are various other subtleties that can offer advantages to existing owners.
The key point that I am trying to make is that every owner has an obligation to work through the details and see if it makes sense for him to join. Rejecting the new club because someone else emotionally states that it is the world's worst system for him will be a grievous mistake as will be joining because someone else says it will work perfectly for him. And yes, both situations are possible because there are many different owner situations.
Art