I was thinking the same when they announced passing the torch to a younger generation.
I'm fine if they go the route of Extreme Ghostbusters (1997). I actually quite liked the show back when it aired. The idea of the original Ghostbusters having students assume the role is what I anticipated if everything had gone as planned several years ago.
Unfortunately, since Harold Ramis is no longer with us and Egon was the teacher in the cartoon series, it'll have to be one of the other guys. I could see Dan Aykroyd (Dr. Ray Stantz) easily doing such.
An adaptation means a few things, creative and legally:
Creatively, you're just piggybacking off someone else's idea; nothing interesting there. It's fan service, yes, but that's about it. If you have something Ghostbusters you want of your own, why adapt? Heck, if anything an adaptation seems lazier than something original.
Legally, the people who created Extreme GB have to get credit and get paid for this movie. If you're a movie company, you probably don't want to do this, because greed; you want more money for yourselves. If they find a way to do Extreme GB, without it being Extreme GB, then the guys who created Extreme GB can probably still come after em, claiming "you ripped off our idea and gave us zero credit/compensation" which could really blow up in Sony's face and cost them even more money.
Some of the scripts before 2016 Ghostbusters did the passing of the torch like with Extreme Ghostbusters which would've been in line with fans' expectations.
Perhaps have a similar plot to Ghostbusters 2 and Extreme Ghostbusters where the Ghostbusters have been out of business for years in this film's case thirty ago until new ghost activity arises.