Countless news, new-talk, and sports stations made the move to simulcast on FM in the era in which WBEN did the same. It didn't work for a number of reasons, in all likelihood because the legacy (WBEN) listeners felt no need to listen on FM. Countless stations discovered that moving an AM talk format to FM doesn't automatically attract younger demos to the same product. What they got was dilution. There was no real need or desire for WBEN to be on FM. The product on AM suited listeners just fine. It's not like WBEN has an impaired signal. It's arguably the best all-around AM in the market.Whatever local direct revenue WBEN is getting amounts to a spit in the ocean for Audacy. They already sold STAR which was a death blow to the Buffalo cluster. They only have one full signal FM there. If WBEN is doing as great as you say, they would have never discontinued the FM simulcast on 107.7...
Entercom blew up the Lake, which had a revenue stream of its own, however large or small, and then David Field became enthralled with the Alt format, which also failed to take hold on 107.7. By that time, the Lake return-option had expired. The format now on the 107.7 frequency is probably the most efficient use of the limited capabilities of the allocation.
It's tough to bring back a format, 97 Rock not withstanding.. That's not to say it can't be done. It can ... but it takes a massive effort, research, focus, promotion and money. And money right now is "too tight to mention" (referencing Simply Red.) It's no longer a matter of "If you build it they will come." The research has to show that there's a pronounced need or desire for the product on the shelf, and the shelf space better be visible, attractive and well-stocked.