We're not that far from having only A or AAA here too. Back in the 90s, when they started using the AA designation, there were a lot more AA teams. Now there are 6-8 different designations within A, some of which would have been AA back in the 90s. I have friends in Columbus who say the same thing, that there is almost no one in AA there anymore either.
Might end up being a bit of a re-categorization like Junior hockey. In the early 2000s/late 90s, there were Jr A, Jr B, and Jr C designations, and it was all over the place. I think (and I could be wrong) that only the USHL and NAHL called themselves Jr A. Most of the Jr teams were Jr B. Jr C was mostly younger kids. At the same time, there was a push in the rust belt and mid west to have "split season" midget hockey, and the response was to have more Jr teams, who were not bound by the split season agreement. Anyhow, the point of the rambling is that I would not be surprised if USA Hockey says there is only "tier 1" and "tier 2" and renders the AAA/AA/A labels meaningless, like it did with Jr A/B/C.