It's easy to dismiss the author's suggestions, but consider this. Moses Znaimer has made a fair amount of money catering to that demo on AM 740 (and 96.7 FM downtown) aiming for an audience that no one else seems to care about. His station will never be #1, but it earns its keep and if you're a Boomer and want to hear that kind of music over the air, there aren't that many other places to go locally. 

Plus that age group is now either retiring or nearing the end of their working lives and many of them have more money than the younger audience everyone else is chasing. There's something to be said for that, although advertisers don't seem to want them. 

I once asked former CHUM newsman Denis Woolings if he was interested in returning to radio by applying to AM 740. I'll never forget his response. "Why would I want to take a job talking to dead people?" 

Still, appealing to that demo may well work - for a while. The only real drawback is that that audience will eventually die off and you'll be stuck without any listeners at all, forcing a format change. But with a younger audience used to listening to music only on FM, online or through their own devices, where exactly would you go next? The same thing will presumably happen to newspapers. But it could be a stopgap measure for a few years.