Bringing back The Mountain would probably rate as well if not better than the current format of 98.9.
KEXP, while they do great work, leans into a new music discovery model and there's a huge gap between them and other stations that KMTT fit perfectly into, but isn't being served now.
Brandi Carlile did very well at the Grammy Awards. Not a single commercial radio station in Seattle plays her music, and KEXP does so sparingly. There's simply a lot of adult rock and Americana that isn't on the air, but has a significant following in the market.
There are a couple of stations that would be no worse off filling that niche.