Documents spell out the exclusive grounds that Disney can use to terminate the resorts existence as a DVC resort:
1. The end date comes (2042 for all but SSR which has a longer date).
2. The government takes it by eminent domain.
3. The resort is destroyed and cannot reasonably be rebuilt, in which case insurance proceeds are distributed to members. A partial destruction that can reasonably be repaired or rebuilt does not end the resorts DVC status but affected members will not be given any priority for reserving at any other DVC resort.
4. Disney goes bankrupt or otherwise becomes insolvent.
5. The members vote to kick out Disney as the managing agent of the resort (which requires a 60% majority vote).
6. The resort is transfered to or merged with a non-Disney entity, an act that requires a majority vote of the membership interests at the resort (i.e., Disney can't just sell to Marriot if it feels like it; the members have to approve).
7. The resort is not maintained to Disney's standards while being managed by a non-Disney entity (see 5 above; this one would apply if Disney decides not to exercise its right to terminate if number 5 occurs).
Look at this way: 1 is a certainty unless Disney offers an extension, 2 can't happen unless some crazy Democrats come to power, 3 is a possibility but unlikely except that Vero Beach could slide into the ocean, the risk of 4 is minimized by Eisner's retirement in 2006, 5 and 6 require the members to go nuts, and 7 first requires the members to go nuts by doing 5 and Disney not doing anything about that when it occurs.
Also, your concern about Vero is unfounded. The Disney entities that run DVC are not non-profit organizations. It is almost impossible for Disney not to make a profit once a resort is sold out, and thus it has no incentive to abandon a resort. The way the system is set up is that: (a) your dues include a management fee payable to Disney equalling 12% of all your other dues and a $1 per member reservation fee; (b) the other dues are set to cover all expenses of running the resort and having a reserve; (c) Disney gets the largest portion of the breakage income (money from rooms rented because they are not reserved by members by 60 days before a date; the breakage income up to 2 1/2% of the resorts total annual dues first goes into the resort fund to off-set dues for the next year; all breakage income over that percentage goes to Disney. In other words, unless a large number of members default on their dues, Disney will profit in any given year.
