RF, my friend, go ahead and taunt all you want. Any reasonably arms-length analysis of HD Radio on an industrywide basis reveals pretty much what BRNout has described.
So seven NYC AMs are using IBOC (WNYC daytime-only, BTW) and ONE additional FM has recently turned on HD? Excuse me: BFD. There are over a hundred radio stations in the market! That's the big HD success story after seven years of relentless hype? One 50kw AM has turned it off and one FM just turned it on??
Give me a large economy-size break. If IBOC was anything remotely resembling what its few proponents claim, stations would be stampeding to install it. It would be like Color arriving to broadcast TV in the mid-1960s. (Ummm....and it's NOT.)
If you want to get a good reading on the HD landscape, get outside of the Big Apple. IBOC is invisible in the marketplace. Almost literally nobody cares about it. And as far as the AM flavor goes, the pop-count of AM-IBOC stations is declining. (FM is essentially static. As I predicted about 35 stations have plans to increase digital power.)
Keep em' laughing, RF.... :