New protocol entirely. The existing stuff is too baked as having positioning, movement, cells as the unit of abstraction. You need to have that available, but not as the core abstraction level. The core has to be areas, words, layout, etc. Not: "move to 20, 35, start red, bold, print border characters"
It's mostly something I'm thinking a bunch about recently. Nothing written up yet aside from the above. I'd go read Mitchell Hashimoto's Lobsters interview fora different take and see how that resonates with you as well as the recent blog posts about TUIs and accessibility.
