For decades, the target of CHR has been adult women, mostly 25-44.
When did that become the case? My recollection is that in the 80s and 90s the CHR target demographic was women 18-34, although by the 90s there had become a split where Rhythmic CHR tended to skew more to the 18-24 part of that demographic, and Mainstream CHR skewed more towards 25-34 yo listeners. So when did 25-34 start expanding to become 25-44? I'm not challenging or questioning your claim, I'm just curious.
That said, I guess it wouldn't be the first time that the demographic boundaries for CHR have shifted, because I'm pretty sure that if we were to go back to the 60s and 70s the demographic target of those stations included teenagers. Certainly in the seventie, judging by the steady stream of Clearasil ads that popped up on the Seattle/Tacoma AM Top 40 stations. (For that matter, I know of at least one Top 40/CHR format in the 70s and early 80s that targeted an adults 18-44 demographic -- that was the expressed target for the syndicated TM Stereo Rock format.)
But to the topic of this thread, I tend to doubt that CHR is a format that will disappear. But I do wonder if CHR and Hot AC may not merge together. After all, those two formats have always blurred together a bit, and some stations (KZZU Spokane and WKRQ Cincinnati come to mind) have drifted from being adult-leaning CHR into very active Hot ACs.
Someone else commented that 70s classic hits formats will go away, and while that is true, it seems like more of an evolution than anything else. How many stations that started as 50s/60s oldies ended up evolving over time into 60s/70s classic hits, then to 70s/80s, and now increasingly to 80s/90s? 98.7 in Dallas/Fort Worth (originally KLUV, now KSPF) has followed that path and is now to the point where even some songs from the early 2000s are creeping in.
But a format that I can't help but wonder about is political (mostly conservative) talk. The audience is aging and audience shares are declining -- unless those stations figure out a way of attracting younger listeners, I don't see how this format doesn't just dwindle away over the next decade or so. And, frankly, I don't see how they're going to attract those younger listeners when there are so many other places for them to go for political talk.