I think having single models of amps and all their respective modeled channels, switches, modes, etc available in one amp model would open a lot of new tones for everyone.
Just speculation on my part, but I believe a lot of current amp models go untouched because there are so many to choose from as it is, as well as the bigger picture in my opinion:
When changing features on most amps, you aren’t resetting all controls back to noon after changing something, Vintage/Modern mode on Rectos, High/Low Inputs on Marshalls, Mid voicings on Engls, etc You flip or flick a switch or button, listen for the change, flick it back and forth a few times to hear what it’s doing, and then adjust your already tweaked tone stack to go from there.
So even though I’m massively grateful for all existing amps, and all amps to come, what I really wish for is condensed models.