My take on future Riviera availability & resale price is that it is too new & too different to follow the patterns we know from other DVC resorts.
Regarding resale price, any new resort costs more on the resale market because there are few contracts for sale, so resale supply is low which tends to increase price. As the resort reaches sell out there are more owners & thus more contracts likely to be sold increasing supply. We don’t know whether the number of resale contracts for a fully sold out Riviera will meet demand or even exceed it. My personal guess is that the price will drift down as supply increases, but the overall economy will impact DVC resale pricing & that’s a huge unknown ATM.
We know even less about future availability. So far there’ve been relatively few Riviera resale owners so their impact hasn’t been felt yet. Presumably as time goes on the number of resale Riviera owners will increase & because they can only book one resort one assumes they’ll do so at 11 months thus making it increasingly tougher to get those point saving resort views & other popular categories especially during high demand times. Maybe this will only effect 7 month bookings, since resale Riv owners aren’t going anywhere else at 7 months, or maybe it’ll make 11 month bookings look like the hunger games since resale Riv owners must stay there & thus decide to use the tricks used for hard to get bookings like walking & speculatively booking (squatting) their reservations to make sure they don’t lose out

we just don’t know at this point.