Going out like a coward? Seriously? Leaving aside whether he should have had another year or not, the way Coyle handled this with the Midnight Flight, and the Airport Ambush certainly left Johnson with no debt to the U.
I doubt anything he said would have been complimentary to the administration, so he followed the "if you don’t have anything nice to say, don’t say anything"! He did what I would have done, took the money and went home.
Once Coyle made him a non employee of the U, he owed the U nothing whatsoever. The U on the other hand owed him contractually some several millions of dollars, which I hope he enjoys and spends wisely. While he might have not been the right man for the job, Coyle hired him, and did little to support him, especially after NIL hit.
As for the fans, and GH fans especially, he owes nothing whatsoever. Whether we like it or not, his contractual obligations to the U ended at the airport that night! And any minsicule or PR related response would rightfully be muted by the bellowing of the "Fire Ben Johnson" herd on GH!