I recently finished reading Daisy Jones & The Six and spent much of the book thinking about what it would look like as a musical. I could see it being staged as if it were a bio-jukebox musical (a la Jersey Boys, Beautiful, etc.), albeit about a fictional band and with an original score. So long as they do a good job with the songs, I think it could actually be quite good.
I also was recently telling someone that I think The Great Gastby could make a great musical with the right team, and then came the announcement that Florence Welch has one in the works.
Some other novels I'd like to see on stage:
Sally Rooney's Normal People (with a score by Shaina Taub)
E.L. Konigsburg's From the Mixed-Up Files of Mrs. Basil E. Frankweiler (I actually think this could be a good potential project for Disney)
Kevin Kwan's Crazy Rich Asians