In smaller aspects, you have this.
K-104 in Poughkeepsie, NY and Fun 107 in Fairhaven (New Bedford, AM) are CHR stations that play some dance. They may not be intensive as Z103.5 (Toronto has always remained dance friendly, and that can go back to the days of Energy 108, Power 88.5, etc.) but they do have some aspects. To a VERY small extent, 92.3 Now in NYC has leaned a notch to current dance (that Z-100 can't really go on since they have to protect 'KTU).
Things are leaning on the positive for dance where a station like a Z103.5 could become a reality for most cities here. It does have to take a "change" in the way core dance fans accept the music, in the sense that if an artist like Wynter Gordon, Laidback Luke, Afrojack, etc. would get some spins, then they would have to accept Black Eyed Peas, Beyonce, Usher, Rihanna, etc. into the rotation. It's that "give and take" that will make things happen here. Perhaps THEN, if dance gets strong enough in that sense, you could see a few stations similar to what Brett does on Z88.9 pop up more extensively with our "brand" of dance.