If KIFM is so good (and not saying it is not decent)...and they are owned by the same folk who own(ed) Smooth Jazz in Denver, then why did they not or were not able to save the format in the Mile High City?
It comes down to this, though BA has crippled the format, it has less to do with the music and MORE to do with the image of selling the station.
It is not "sexy" to buy Smooth Jazz...and though the affluency of the listener of the format is much more attractive then other demos, it is NOT attractive to the agencies who represent advertisers.
So if you want to really know the the reason of the demise of the format, look no further than the purchasers/buyers of the advertising for the advertiser.
Why do you think 18-34 is so coveted? Because the illusion of the sexiness of their dollars and image...the reality is that 25-54 and 35-64 have the disposable income to make big and expensive purchases, but they are not perceived as attractive and viable to those making the ad buys and decisions.
Perception has become reality.
When a 20 something agency rep is trying to convince their luxury auto client to buy the CHR instead of the Smooth Jazz station because they (the rep) knows the format better and personally likes it (just one example that has happened way too much) that displays the ignorance/bias and complete lack of understanding of your client...but that is what happens when all an agency's criteria for a buy is #'s, and they don't look beyond them to the qualitative of a station...but those agencies are often not in the market and are too lazy to do further research to do what is in their clients best interest, and not their own.
Truth is, there was nothing wrong in making Smooth Jazz more mass appeal and by playing some crossover...for those that think the format should have never dabbled in those waters is akin to saying Rock stations should never have embraced AAA artists into their format...and like in Smooth Jazz, of those different artists, you only play a select few that fit the texture and essence of your station.
Issue wise musically, the thing that hurt the format were the damn cover tunes that were instrumentals, that gave off the percepetion of elevator music...though BA and others argued it helped create familiarity. it did do that to a degree, but the negatives I saw in testing cover tunes was off the charts. Familar sure, but familiar enough to turn off listeners.
Combine those factors and you have two of the reasons Smooth Jazz failed...a third was that the format was not getting any new/younger audience to replace those aging out of the 25-54+ category. Hot AC has CHR, Classic Rock has Modern Rock, AC has CHR (to some degree) Oldies has a combo of Hot AC, CHR, and Rock, and even AC. What does Smooth Jazz have? No "feeder" format, like a farm team in Major League Baseball.
Those are the reasons...not because we played too much Kenny G, or too much Urban AC vocals, or too little David Arkenstone or Musical Star Streams (I am being a bit facetious), but many think the format should not have evolved. If SJ had not evolved some, we would have been having this conversation 10+ years ago, or better, the format would never have been more than specialty programming on Sunday for the local AC or Classic Rock station.