Of course they do! But, imposing a special assessment (that they have to then pay their share of) isn't the way to do that, because it is dimes on the dollar, not pennies. Pennies on the dollar would be taking back KBV deeds through Ovation or Certified Exit or whatever they are calling the "give us your deed and we give you nothing in return" program---and they've stopped doing that.
The fact that Wyndham won't even take them for free is at least suggestive.
In contrast, foreclosure in Hawaii (which, AFAIK, only has judicial foreclosure or a forced sale process) is neither easy nor free.
What buyback program? Pathways lasted for maybe a few years, at most--almost no one holds a Pathways-eligible deed, and most of this resort was sold long long before Pathways was a thing.
Even the model where you get three years use of the points after surrender isn't a huge burden on Wyndham, because they can use unsold points to back that. They aren't paying extra to make that happen.