How long is it gonna be until Disney tries another stab at a 2D animated movie, maybe not right now because of Covid and all but I could seriously see a huge interest in Disney doing another one, You'd get a lot of adults along with kids too, because people love to be nostalgic about things and the 2D animated movies were a big part of looooooots of people's child hoods
I know it takes a lot more time and a lot more money to make 2D and it might not work for another studio but I feel like if Disney came out with a marketing campaign "that 2D animated Disney movies are back baby!!" it would set the internet ablaze
It's probably gonna be a good long while, if they ever do it again. For now 3D is pretty much the standard and it's overall cheaper and easier to make, so there's no reason for them to mess with a good thing (financially speaking). And casual audiences seem to perfectly okay with it.
Someone, be it Disney or some other studio, is really gonna have to do something big to break the mold if 2D is ever going to be viable for theatrical films again.