In all fairness, every single Disney timeshare contract that preceded Riviera makes only one guarantee: that the owner will have the opportunity to book their home resort 30 days prior to everyone else.
It does not guarantee that the hotel side of the resort, restaurants, spas, any established transportation system, or theme park for that matter (think: “monorail resort” sans monorail or MK) will be maintained. Your ADs pay only for your timeshare building.
I think people tend to ignore this as it seems far fetched that VGF would lose the hotel, restaurants, spas, monorail, or MK, but in reality, those are the exact terms that every Disney timeshare owner agreed to. I’m not saying it will likely happen- I personally don’t foresee this happening, but any feelings that Riviera is detrimentally or significantly less secure in terms of contractual guarantees, than any other Disney timeshare property would require ignoring the insecure nature of any timeshare, Disney or otherwise.
This is why a Disney timeshare is strongly recommended by many to be viewed as a luxury purchase, a sunk cost, and a buy-to-use product, not an investment.