I don't think Nintendo is gonna budge on ACNH in the slightest, but I'd definitely love to see something happen. I get on Pocket Camp every now and then and I always get instantly jealous that they seem to have so much going on all the time. The best I can hope for is that the success of Animal Crossing New Horizons will be enough that Nintendo aims to go above and beyond on the next one.
We're many-many years out from seeing the next game yet, but hopefully by then there will be no pandemics or epidemics, and everyone will be back to working in full force. The slow drip updates for this game were dreadsome, and most of that time spent waiting was for nothing but a Holiday, which didn't matter if you weren't trying to time travel to the event at launch. Off the top of my head, the only things that really felt like updates were the swimming/art update, which really should have been included from the start, and v2.0, which included a bit of QoL features and game enhancements.