That said, one way in which owners could be impacted in the long run is if the rate of defaults rises dramatically. Owners of a resort must collectively pay for maintenance and upkeep on the property. But if there are fewer owners, the burden increases for those who remain.
Imagine that in 2040, 25% of OKW owners have defaulted (failed to pay loans or dues.) The remaining 75% would have to pay to maintain the resort. That could drive up their dues higher than expected. Some of the costs are variable--25% of the rooms technically no longer need to be maintained or cleaned, there are fewer check-ins for the front desk staff to handle, fewer bus passengers, etc. But the fixed costs like pool operations, security, landscaping, taxes and others still have to be paid regardless of the number of owners.
It's a problem which other timeshares are dealing with today. An undesirable resort in an undesirable location is not a good combination. Lobbying groups are even pushing for legislation to block owners from walking away from timeshares. Since most timeshares have perpetual ownership, this even impacts the heirs of a buyers--the children or siblings of a deceased TS owner are stuck paying for a property they never wanted.
Disney's ability to re-sell older contracts and even rent the rooms to non-owners at nightly rates mitigates this risk.
DVC still has means to rid itself of points left behind via default.