There is no dividing line between genre fiction and "literary" fiction that holds up historically.
I feel most writers at the top of their genres are adequate reading- Doyle, Chandler, LeGuin, O'Brian\Forester, etc. Have read them all.
Genre fiction is stuff you don't like that sells more than you
Good genre fiction is better than bad literary fiction.
Carrie has aged a lot better than The Rachel Papers
Who still reads AS Byatt?