There is no "programming" discussion here. This is an economic discussion, and Miller knows exactly what he's talking about. You don't double, triple or otherwise increase the number of stations available to listeners in a given area when there is no economic basis for doing so, and then pretend there will be no consequences, particularly in a recession. Even a fully automated station has operating costs, which don't magically materialize out of thin air. They somehow must be paid for. Spreading budgetary dollars across two, three or four signals, when those same dollars were only supporting one signal previously, is a recipe for disaster. If you could, with a wave of a magic wand, make those HD secondaries pay their own way, it might help...but with pitifully few receivers out there, no measurable audience on the secondaries and programming that mass audiences are clearly not interested in (because if they were, that programming would be on primary signals, not secondaries), the whole idea of all these "stations between the stations" is nothing more than the radio business once again failing to learn from its own past.
Radio is throwing dozens of eggs into this basket labeled "HD," and running all sorts of audio streams without any economic underpinnings, in the hope of someday having them spew forth an ROI. Sorry, but they're in for a rude awakening, particularly with such blatant apathy for the product on the part of consumers. Wall Street, the current rulers of the roost in radio, does not sit still for very long when money is spent with no ROI. If radio station owners can't figure out how to jump-start this thing...and do it NOW...it's all going to crash in on them.