Few reasons why scooters are still considered (little kid toy):
1. People that have been for years in our sport and still caring about BMXers' and skaters' attitude =]
No hate, CJ, but that looks a bit weird when you have mentioned it in all 5 reasons.
Give it a couple of years and you will see new clothing brands, new companies with badass names, more grown-up riders, better teams (as the competition will only be rising), more consistency and so on. Like serously, last summer I still have been riding my old reinforced pro model (inb4: sure, that's cause you live in Russia, lol) and today every single kid here rides a scooter with no stock parts. This is a fast growing market, so trust me, some more amazing things will happen soon including the growth of recognition and respect.
PS: That's judging from my experience, maybe in USA it's a bit different.