I just found/saw this thread. How disappointing for the owners and folks with booked vacations this summer.
I was one of the original (pre-development) owners at Split Rock (Westwood Lodges) when they were selling them as 13 yr RTU with a 7 yr option to extend to make it a total of 20 years. My 20th year of use was in 2002. Out of those 20 years, I think me and my first husband stayed at Split Rock three times, and I stayed at their sister property (Bonita Springs Golf Resort in FLA) three other years as well. The many exchanges we got from this resort fostered an addiction for travel via timeshare ownership, hence my acquiring several more via resale starting in 2001.
I seem to recall there being financial problems with the original owner/developer (Jack Kalins) with rumors of misappropriation of MFs and some other shenanigans. It was nice of them to hit all of us 20 yr RTU'ers with a three year special assessment in years 17, 18, 19 (in my case) . . . and without an offer to renew or buy-in as a full deeded TS owner. (Not that I would have bought in again.)
Anyway, I hope things work out for all involved on the vacation/user side of the equation. As I said, it sounds like a very unfortunate situation.