Great points, all.
If the new owners persist with this attempt to force the timeshare purchasers into submission, it sounds like a good island lawyer is needed to bring this before the Dutch courts and resolve the issues once and for all. You all purchased in good faith and since the convening Dutch authorities are already questioning the integrity of the island governments, this might be a good test case to see where they really stand. Sadly, this wouldn't be an inexpensive solution.
I can't help but wonder what will happen to those who are scheduled to stay there in the next few months while this is resolved. I wish you all good luck.