Well, according to the rulebook, the FIM allows MX3 to field up to a 500cc 2 stroke. So if someone actually wanted, they could race a AF500 or even Maico's etc. That would be something that someone over the pond should look into. According to magazine tests, the 500AF's on both Kawi's and Honda's, outran the 450F.
Next, is my personal experience recently, that made me happy. I went to get my tires mounted, since I powdercoated them, I didn't want to scuff them. Anyways, I showed the 20ish kid my CR500AF pics, and he said, "I would so trade my 450F for one of those, I'm so over the 4 stroke thing." I was like, awesome. I hope amateurs start moving away from the 4 strokes, and start showing the general population, that the 2 stroke when fairly raced, can win still. If we start having enough racing in the local races and winning, we maybe won't even need the pro's riding them. Other than some of our people like the team John is setting up. If everyone remembers back, the 4 strokes didn't take over until 04ish, but the bikes had been made since the late 90's (YZ400F). So it takes time to change everyones mind. Hopefully, the tide is starting to shift and we will start seeing it more and more. Just my 2 cents on things.