Haven't seen any final numbers yet. The persistent rumor throughout the show was that total registration was around 7,000. I can believe that.
As for actual *attendance,* people were hearing/repeating numbers all over the map. Some of the numbers sounded dubiously low... Supercomm wasn't a crowd, but I'm pretty sure we beat the attendance of a typical San Jose Giants minor-league baseball game.
By the way, here's a telling anecdote... if you look at Picture #4, you can see the Hitachi booth. Hitachi was telling me that originally, they were in the CENTER of the show floor, not near the back.
Which suggests that a lot of exhibitors bowed out after the date changed.