As a subscriber to the radiolists.net Broadcast remailer, I saw some remarks yesterday from Warren Schultz, the CE of WLS, and without quoting them verbatim and in full here (not wanting them to be deleted for TOS violation), he basically says that when he tunes the Chicago FM dial now "the hiss of IBOC carriers covers the entire Chicago FM dial" with the currently permitted 1% injection level (which, as he noted, iBiquity admitted they used initially to AVOID interference with analog). He says it makes no sense, with so few receivers in the hands of consumers, to effectively kill analog-FM reception so those select few can have properly performing radios. If 80% of the radios out there were HD, it might make sense, but not like this.
He predicts that 10% injection across the board will effectively kill the FM broadcast service: "Going to 10% power will kill analog reception resulting in a sea of carrier hiss."
Another smart engineer who has come to his senses.