It still does not matter. Relevant listeners (ones who can attract advertisers) are obtaining content elsewhere. Why is that hard for people to understand?
The other thing people don’t quite understand is nighttime ratings. Even if the station cleans up in the overall ratings, chances are very good nobody really cares that much about the ratings from about 6pm-6am. Listenership plummets in most places after the drive home. This is why having a nighttime jock live is less popular, and an overnight jock (the way so many on these boards, myself included, cut their teeth on-air) is now either unheard of or perhaps one per market for EAS PEP duties.
So long as WBT-AM can cover most of its current metro coverage area during most of that 6am-6pm ratings period, it has just as good of a chance of making ratings as it would with its current transmission site.
If they went 50kW days/0.5kW nights ND, they could sell that valuable property, offer the Blaw-Knox to a broadcasting museum or a ham group, diplex (or even build) a single tower on far less land, and still according to how stations are rated will do just as well.
You might see some difficulty come winter months when they won’t run 50kW until around 7am and drop to night power around 5pm…you’ll lose 2 hours daily tops on each end of the “money” ratings.
Now, if the station isn’t crushing it ratings-wise currently… why would you worry about losing a few dozen hours of decent advertising revenue in a year for downgrading a transmission site, when by downgrading, you brought in millions up front?
And all of this is assuming WBT-AM will one day have a new format that people will bother to listen to. Given the precarious nature of AM radio and its downward spiral, along with its almost universal non-use by people under 35 or so, any AM station going alone without rebroadcasting on FM will be difficult…