That's the thing, C-QUAM AM stereo is a technology that really works, if you have a local radio station using it and a stereo AM receiver, it's a worthwhile improvement in the sound over mono AM. As we've found out, the receivers are also built better to receive C-QUAM, so you win all the way around.
Stereo on a narrow band AM receiver with talk radio is probably not going to improve the sound much, but with music and ads, and greater bandwidth in receivers to get more highs in the sound, stereo can be a winner.
It also should be easy, with the digital receiver ICs we have today, to program into them C-QUAM reception, and since Motorola's patent on C-QUAM technology has expired, they should be able to put it into receivers for free!
Boomer