The great drawback of TUI app is that are quite unusable from touch devices, or generally devices without a keyboard). If you find a way to make them usable on mobile I think they can get a great comeback
Better yet, make all user interfaces the same as a toaster. Everyone can use a toaster. Bread goes in, push the lever. One universal way of thinking for everyone and everything. No domination by the tyranny of choice.
And if that requires any tradeoffs like it did for GUIs (no hover, no small elements) it'll end up getting dumbed down for mobile like GUIs did.