Well, the difference so far is Walt Disney World (and
Disneyland): Most timeshares offer nice rooms in nice locations. The problem is, that there are many, many nice locations for new timeshare offerings. This devalues any existing (and ageing) building. The
DVC resorts at WDW and DL operate in an environment with far less competition. As long as these locations remain attractive (within the Disney bubble, transportation,...), they will probably hold their value better than other timeshare offerings. DVC locations outside the Disney bubble face more intense pressure.
It will be interesting to see, what happens with HH and Vero as dues increase further. The regular room price is dictated by the market (what people are willing to pay) and not cost. But if there is an extended mismatch between market price and cost, something needs to give.