Radio stations are a business, and businesses exist to make money. Obviously if Alternative was a profitable format there would be radio stations playing it, believe me. But in reality that is not the case. There are always those 1 or 2 dance fans on here telling everyone how dance and EDM are the "next big thing", and that it's catching on, blah blah blah. Well they tried it in Boston and the station only lasted a year. That's what "diversity" gets you. Radio stations that appeal to the masses are the ones that make money. Luckily for everyone else, there are a myriad of other free music sources to hear exactly the type of music you like.
Personally I'm looking forward to this new station. Urban AC (assuming that is the format) is one of my favorite types of music, and it will be nice to have an alternative to WBLS.