Hot AC/Adult Top 40 isn't going away under any circumstances, even as CHR/Pop powerhouses (KIIS & WHTZ come to mind) are enjoying their best ratings since 20-year old Taylor Swift was in diapers, and WXKS/Boston is racking up nine-plus shares.
Hot ACs play a ton of rock songs from the eighties and nineties that most CHR/Pop stations can't touch, and epecially those which are owned by Clear Channel, most of which are patterned after WKFS/Cincinnati, as Sean Ross has pointed out for almost decade both in his columns at Billboard & on this website via his RossOnRadio and 25Plus newsletters.
Hot ACKBIG/LA routinely plays Joan Jett, Def Leppard, Springsteen, Mellencamp, U2, Genesis, Guns N Roses, Bon Jovi, Duran Duran, Foreigner, New Order & tons of other rock stuff alongside BEP, Lady Gaga, Keisha, Beyonce, Alicia Keys & other artists that 99.9% of the CHR/Pop stations out there won't touch given their hyper-addiction to super serving the 12-17 & 18-34 demos.
KIIS hit a 10.0 share in the fall of 1984, back when top 40 radio was truly a mass-appeal format encompassing the best of all genres; even when you add the unconventional CHRs out there that play alternative music yet still enjoy killer ratings (KBKS/Seattle & WXXL/Orlando among them), CHR/Pop stations these days play very little rock music, excluding Rob Thomas, Nickelback, Green Day, John Mayer, Daughtry & a few other rock acts