There are two problems with timeshares of this vintage, and both are happening simultaneously. Problem One: The buildings are aging and becoming more expensive to maintain. Problem Two: the owners are also getting older, and defaulting in increasing numbers.
Wyndham solves Problem Two by offsetting some of the foreclosure costs, and folding the acquired inventory into CWA, making that inventory "productive" again, where "productive" means "someone is paying the fees on that interval." However, the first problem is still there and only getting worse. And it does not matter how well you maintain a structure, because you cannot prevent everything. What's more, older resorts' popularity fades. Yes, there are long-time families who go back year after year, but look around---there are fewer of them every year, because of Problem Two. The next wave of timeshare buyers are not beating down the doors to stay at any of these resorts, they are more interested in newer, shinier places that are often in better locations.
Eventually, every resort is going to reach the end of its serviceable life. You can try to put that day off by pouring more and more money into it, but at some point the line is crossed. Reasonable people can disagree about whether we are at that point with any of these resorts, but I don't think closing any of them is unequivocally wrong.
Timeshares are sold by lots of one-liners like this, and most of them are not entirely accurate. However, Wymdham is honoring this part of the deal. At least, they are for points owners. If you want to keep vacationing, take the swap. Yes, the fees are probably more than you're paying now, but that was going to happen sooner or later no matter what, because of Problem One.
Wyndham is far from the only management company/developer facing these questions. You can't swing a dead cat on TUG without hitting a discussion about a resort that (a) has an eye-watering special assessment to fix some serious maintenance issue or bring it up to brand standard, (b) is dropped from the brand by refusing, (c) has fees skyrocketing due to an ever-increasing share of non-performing weeks, (d) is trying to consolidate owners into a smaller section of the resort and selling off the remaining buildings, or (e) liquidating. Given the history of resort development, we are going to see more of this in the next ten years, not less, and there is an entire management company (Lemonjuice) whose business model is "Let us take the reins of your dying resort, and we'll figure out the best path forward." Resorts who take Lemonjuice on don't always close right away. But no one hires Lemonjuice on a winning streak.