HD Radio Interference?

Doc Searls is saying that HD radio signal might be interfering with neighboring FM stations. I wonder if this is going to get some regulatory attention? I guess the hope is that FM doesn't become as bad sounding as AM in the pursuit of HD technology. Of course, if all the broadcast television goes to high definition, then it makes sense for all the radio to do this too. And actually, a high power AM station like KMOX in St. Louis or WWL in New Orleans could really put out some far-reaching digital content. Hmmm....

What I'd love to know is what the world sounded like before all this wi-fi, radio signals, television signals, etc. in the air. Would it have been the same or much different? Is my office noisy from the wi-fi signal?

Aristotle said that humans can't hear the earth grinding on its axis because we heard it from day one in the womb and thus silence is defined as including that sound. Okay, I'm getting way too philosophical on a HD Radio fan blog.