Anyone with any relationship with a seasonal resort probably needs to worry about this. However, it's probably fair to say that, in the "old days", those weeks were getting more value than they "should have" if you truly believed in "like for like".
The fact is simply that many of these weeks have negative value---they cost more to own than they could ever be worth to anyone. Dealing with these is a hard question, to say the least, becuase in some sense the offseason owners are subsidizing the in-season ones. Some resorts (I know of a few in Michigan) bundle weeks in packages on a single deed, so that, for example, you have to own one offseason week (or more) for each high-season week you own.
What resort area isn't seasonal? Every one of them has a slow season. We are fortunate in Colorado, because we have a lot of weeks that are red (yes, many are on the pink side of red), specifically all weeks 47-52, 1-15, and 21-39 are red in RCI. We have two maintenance weeks, and that leaves just six fall and four spring weeks, ten total weeks that RCI considers blue. That isn't as bad as some, not as good as Florida or Hawaii, certainly. Florida has a hurricane season, too.
Right now, RCI will take any red (even pink) week as PFD for full value. I expect that to change soon, especially after looking at the new points grid, and when that changes, I wonder how RCI is going to explain away the decision to value some red weeks as higher than other red weeks. I suppose they won't even try.
I think people forget that Colorado has a high demand summer season. It's odd when people talk about how Colorado summer has more inventory than demand. I am somewhat of an expert in Colorado demand, owning 8 weeks and studying trading power of our weeks for over 25 years, which are good and which aren't in RCI, dumping those weeks into PFD when they aren't working for us as weeks. Our Val Chatelle summer weeks are on a fixed rotation, changing every year, so I get to experience every possible exchange power from very high to fair. It's so drastic between weeks, and that is why I deposit when nothing is available for exchange, whatever week I am depositing. Then I test the trading power, either with the guide or on my own, and I usually have great results.
By the way, all of that inventory you see in Pagosa Springs and Estes Park in winter, not at all close to ski areas, and the only desirable season is really summer in those areas. Very hard to get summer at Ram's Horn Village, Estes Park, in RCI. Pagosa, hard to get summer, but lots of spring and fall weeks always available for exchange. I looked when Tombo kept posting availability in Colorado, and I would say not much red. Sure, RCI and II lump all of Colorado into those categories, but that doesn't make those desirable seasons for every single resort area in Colorado. Estes Park has far more weeks that are blue than red.
As far as Twin Rivers is concerned, I would like to see it cease to exist as a timeshare and sell it as a whole-owned condo complex. It has so few amenities, and the units seem more like condos than a resort property. I wish we could just do it tomorrow, and so does Philip, but dissolving a timeshare requires 100% cooperation from the owners, and some people are very attached to their weeks, so they won't go for it. The 3 bedroom units would easily sell for $220K furnished, in this market. Some owners paid over $15K for their single ski weeks. There is no way to give them back what they think their weeks are worth.