The reality is that most Disney guests book vacations much closer in time to their trip than the kinds of people who post here (since even using these boards is much more pre-planning than most guests do). It makes no sense for Disney to start offering discounts until a few months out, when more people have started making their vacation plans and Disney has a better sense of which resorts/room categories are not booking well and need to be discounted. This year is weird because more people are rebooking to 2021, but Disney still has a lot of uncertainty as to how many of those people will actually show up if a vaccine isn't ready in time and Disney still has restrictions (masks, no fireworks/characters etc.) in place. I would expect discounts for 2021 won't be realized until much later this year.
I would place very very good odds on Riviera being discounted considerably for 2021. DVC sales have been sluggish due to resale restrictions and tepid reviews, and so there is still a lot of cash inventory, and the discounts offered on it earlier this year were pretty good (40% off for Visa cardholders; 25% off with Fun & Sun). I actually was tempted to use my 35% from my
free dining cancellation to book at riviera this August, but chose to go to the Poly, because I figured discounts next year would be better at Riviera than Poly and I could wait to try Riviera then.