Corporate thinking at its finest, meaning that its an unoriginal idea that smacks of monkey-see, monkey-do. CBS has had some success with the sports talk format in Detroit, so that just MUST mean that the same will be true in Boston and Washington. We'll see about that.
The one thing I'll give them is at least they have a foundation of sports play-by-play and rights to the Pats and Bruins (so they can say they're "the OFFICIAL station of the Patriots") that can provide some credibility to the uninitiated. Whether that's enough to best Entercom's WEEI is the big question. What's sad for the average Boston radio listener is that I could see Entercom trying to upstage this move by popping WEEI on an FM station like 93.7.
The second sad thing (to me) is the loss of a little more programming diversity in metro Boston. This is already one of the most format-poor large markets in the US. It is about to get a little poorer as a result of this move. The one thing I wonder is why they decided to juggle frequencies. I suppose 98.5 is a little stronger to the west than 104.1 (thanks to co-channel interference from WPHH), but within the market itself there's little difference.
As for Mix, it's BORING radio and I'd love to see them do something different with 104.1 than that.
Will WFNX prosper from this? Probably somewhat.
Personally, I think WAAF will gain at least as many listeners out of this as WFNX - even if WBCN's playlist skewed more alternative and current. That's because 'BCN still had quite a few listeners who flipped between 'AAF and 'BCN. Many will stay at 'AAF. Also, suburban listeners have some out of market/rimshot options like WGIR, WBRU and WHJY to listen to. Again, aside from WBRU, they're not alternative rockers - but WBCN's playlist has been a bit schizophrenic over the years so has attracted more active rock listeners than anything else. And, they haven't been drawing in great ratings - so a format change was probably due. I just wish that CBS had been more imaginative.