I think Sufjan is a good shout - he was someone I had in mind in my original post.
Thought about the National also as others have mentioned but figured they’re a little old already and given their various other pursuits might pack it in at some point.
A couple not yet mentioned - I think the war on drugs could still be cruising around for years to come, and as a hot take I’m gonna say Mitski could also still be doing something whacky in a couple of decades time and putting stuff out there.