I think it depends a lot on Covid-19 outcomes. If there was a best case scenario or something close to it - a cheap, easy to distribute vaccine that offered almost total immunity, for example - I think prices would skyrocket (probably not immediately, as that would look really bad, but after a bit). If it is a worst case scenario - multiple waves of the virus coming through, international travel closed indefinitely, quarantines that are on-and-off over and over again - I think there will be steep discounts but that will be because the experience will be curtailed a great deal, with many things closed and tons of uncertainty in planning, in addition to other possible disruptions, like food, beverage, and other shortages due to a disrupted supply chain.
If it's a 'middle case' scenario, which I assume it will be - confidence builds slowly, over time, as we learn more about the virus, better treatments are available but not a panacea, and vaccines of varying efficacy come out in waves - my thought is they might split the difference and offer extremely high priced experiences on one end of the spectrum and do heavy advertising for sales and discounts on the other. This seems to be what they've done in the past - for example, creating both the Art of Animation to allow for (relatively) less expensive onsite hotel stays, while also offering extra fast passes with club level reservations that cost a kazillion dollars.
My hope, if this happens, is that there will be some mid-range 'extra' experiences offered that don't cost a kazillion dollars - along the lines of the "Early Morning Magic" and dessert parties. I'm envisioning a cash-strapped Disney offering "Early early eaaaarly morning magic at 4:00 am" and me going "I'll take it!!" ha ha! I mean I'm joking, but not that much - it's a creative place, after all, I think they might get creative in their offerings.