The day they take out the theming at GFV and make look like a nice generic hotel room will be the day members finally revolt.
And by that you mean, they'll collect dues from a new batch of starry-eyed Disney lovers who buy our VGF contracts because it's right next to MK.
I feel like a lot of this is largely the evolution of a relationship.
During courtship, DVC wooed you with flowers (annual passes for OGs like you, FP+, giftcards for newbs like me), dressed nicely (theming a la OKW, triangle plates, Victorian furniture), and stayed in shape (clean floors, nice couches).
Then you said, "I do." Things were nice at first. They shouldered the housework, took you out for date nights (welcome home bookings, personal welcome home notes from your guide), but you were still in the honeymoon stage.
Soon you start to notice this strange habit they have of not washing their hands after they pee (uncleaned rooms between guests). You ask them to with a bit of disappointment in your voice, and they apologize, kiss you on the forehead (some token Disney magic compensation), and wash their hands like they should've in the first place.
After a few years and the honeymoon is over (resort fully declared and sold out). You've come to expect that they're not going to wash their hands every now and then. You cheer a little inside when you bring guests home and see they actually washed their hands before exiting the bathroom (phew, a clean room). You've come to accept a lot of this as "this is just what marriage is" ("this is what a timeshare is"), and you don't complain that they don't go to the gym anymore (sagging couches at SSR), you know they're going to leave dishes around regularly (IT failures).
Now there's a comfort to this relationship, you tell yourself. You like that, every now and then, there's an interesting conversation you'll have about something that happened at work, or some bit of news (new E ticket attractions), the timing is just right and you do the deed occasionally (Membership Magic), and you're both now prioritizing paying the bills (collecting/paying ADs) and putting a roof over your head (11-month booking).
At some point people decide, "how did I get here?" ("what happened to all the theming?") and they get out. Others will settle into the familiarity.
Everyone has a limit, but sadly, we're a replaceable asset. If we tire of the banality of this relationship (IT failures, unclean rooms, old furniture, 7-month booking, 180 day ADR, crowds, increasing prices, etc.), we're free to leave. We can walk away with great memories, but we're replaceable. Barring some major shift in how Disney does theme parks, someone else will always be willing to step in and pay our dues. When we said I do 25, 10, 5, or 1 year ago, the house won and they hold all the cards on how this relationship will play out. Best we can do is walk away when it's no longer fun.