This is a far more cheerful future, but technically it's doubly fictional.

I've picked up a bunch of Legion books lately, but the other day I found three issues of this series. They might've been the ones I needed for the set! From 1988, Who's Who in the Legion of Super-Heroes, featuring "The Nik Feelds Show" Written by Ty Templeton, art by Curt Swan and Kurt Schaffenberger.

This would've been the 30th anniversary year for the Legion, and they had more than enough characters for seven issues of reference; but each issue also had a short lead-in story. Most of this one was "Cadets," a fictionalized holo-vid of the Legion Academy; which then segues into a talk show promoting it, with one of the film's consultants: Colossal Boy's dad Wynn Allon, who was also married to Marte Allon, the former President of Earth! The story then moves to Wynn and Marte discussing his appearance, and how the producers didn't really consult him much, indicating the film wasn't especially accurate, but that might be dramatic license. Wynn then implores Marte to mingle at the Legion Parents' Reunion party: she doesn't want to, but Wynn reminds her, it's at their house, right then. There's about 90 continuity references in like 12 pages; something you can only get away with if you've been around 30 years.

Since this was the last issue, it's mostly the end of the alphabet, but still has some big names like Ultra Boy, the Time Trapper, and Wildfire. The Wanderers also get a big push, for their spin-off, which didn't really take off. I think I have one issue of it around here somewhere; but it might've got real weird by the end.