The no filtering laws aren't going to change until we can convince the general public that we're not going to crash into their cars and then just ride away. That's not going to happen because so many of the highly visible riders, be it in the news or on tv shows or whatever, don't ride responsibly. They speed, swerve through traffic, get in chases, run from the police, etc. The general public sees a sportbike and immediately thinks 'wannabe racer who only cares about himself.' Once that changes we'll have a chance. But until then...it ain't gonna happen. We also have a LOT of people who live in rural areas, where there is no real traffic congestion and thus no real need for filtering to take place. Those people aren't going to know much about it, and therefore aren't going to support it.
Helmet laws are a completely different animal. Most of us who don't like them simply don't like the idea of a nanny state telling us what to do. It's my life, if I want to put it in danger I will. It's none of Washington's business if I don't want to wear a helmet.