The word "diversity" itself zoomed upwards starting in 1989, peaked around 1999, but has only dropped slightly since then. As a non-accusatory happy word, it doesn't inspire as much heretical thought as an accusatory word like "racism," so it's more likely to endure in exhoratory prose.
We're now well into the Brezhnev Era of DiversityThink, when everybody is bored and cynical about the ruling ideology, but it still has 53,000 tanks, so most people assume it can't be all that off-base.
To get off topic, how about Nabokov v. Borges? Borges, whom Nabokov spoofed as "Osberg" in Ada, has been in the lead in English language books since the early 1960s.
How about Golden Age Sci- Fi writers: Heinlein, Asimov, and Bradbury? They seem to be mentioned: Bradbury first, Asimov second, Heinlein third.