If iBiquity indeed has a doomsday fantasy, they'll just have to add it to their collection.
You know...like: CD-quality, near CD-quality, AM as good FM, digital coverage equals analog, millions - no, Billions sold, hundreds more stations have converted, Michael Jackson was secretly injected with Demerol by Sarah Palin, etc., etc.
If one steps away from the blogs and RW/RWEE for a nanosecond, you get the real-world perspective: notwithstanding the current desperate lunge for a digital power increase, HD has become a kind of industry annoyance and joke - kind of like a sewage-treatment plant upwind of a vacation getaway. It's a kind of distant nuisance, but every once in a while you get a whiff of unpleasantness.
Equipment sales? Stopped, except for a rare and very occasional instance. Receivers? Don't make me laugh. Talk to any honest engineer and you'll find someone who hates HD. The checkbook has snapped shut for the foreseeable future on cap-ex. HD listeners are about as commonplace as mastodons wearing tutus.
Like the chronic stink, HD doesn't go away. It isn't very nice. But it doesn't really mean anything either.