This whole situation is definitely going to eliminate a large number of passholders, likely because they will eventually expire (if they haven't already) and with so much fear of the virus, a large portion simply won't renew. Plus, I suspect Disney will put new pass sales on hold until they get to a number of passholders that they want to have.
I agree in general that there were too many APs. I have been saying for awhile that the lower tier ones needed to be eliminated (the 2 So Cal options). Crowds are really not bad at all on days those are blocked out.
I think when Disneyland finally reopens, we are going to see some drastic changes around ticketing. I expect them to completely eliminate some pass types (likely Sig+, Premiere, and the So Cal ones). I think the remaining ones will perhaps have a price adjustment to accommodate for the reservation system. Or, the entire AP system will go the way of the Flex pass. Perhaps the Flex pass was a test and it just happened to be that we now find ourselves in a situation where everyone must make a reservation.
It will be interesting to see how it all plays out, but I expect that Disney will have to find SOME way to "pay back" current AP holders of higher tier passes (Deluxe and up) since so much value has been lost. Perhaps a nice discount on renewal or larger discounts?