Alas, no. It's not your imagination. There is some fic, of course. However, it's not often requested in exchanges, though I usually nominate it in ones I'm thinking of signing up for.

Also, a fair number of writers of yore have moved on, if not entirely, then in large part. (Greener pastures. Shiny new fandoms.) It's the "critical mass" effect in reverse: a sort of vicious circle where fewer people requesting means fewer people writing means fewer stories posted means even fewer people requesting....