When jras20 gets the news I'm afraid his blood pressure is gonna hit the roof..!
I've been watching the moves on this, and it's a bad, bad idea. If it's approved the NAB would probably demand protected status for the "AM on FM" variety (unlike the usual crop of FM translators and LPFM's, who have to go silent or find another frequency if interference becomes a problem). This is just another in a long line of patches like AM stereo, expanded band and "re-adjusted" pre- and post-sunset power levels that has disaster written all over it.