Well, maybe. When 1 of the 2 AC stations in Atlanta changed format, B98.5 (WSB-FM) no longer had direct Christmas music competition. They continued with all Christmas music, and of course their ratings went through the roof. However, when January arrived, a good portion of the listeners who left when they went all Christmas didn't return. So they decided that as long as there was no place else for listeners to get Christmas music, they could get away with perhaps 4 Christmas songs an hour.And they would lose 50% to 60% of their usual Christmas share. The Christmas music weeks are by far their very biggest of the whole year.
Their ratings still significantly increased though not to the extent they did with all Christmas music. But their ratings early the following year were much better. So that's what they have continued to do.
That said, whatever B101 does has nothing to do with whether or not WJBR is around. WJBR has not been a factor in Philly.