At present, we are kind of stuck in the cycle of creating an APM that everyone (except the Feds) thinks is a piece of ****. ASTRO will do what they can to make the turd "shiny" as others have said. Then, mere days before implementation the emails, texts, and phone calls flood the inboxes of our elected representatives and CMS pulls the plug at the last minute and goes back to the drawing board.
Though this is not sustainable, we can keep this cycle on for as long as possible. The best thing we can do is to include protons in the APM. Protons have a massive lobby and state pension funds (like in TX) include interests in protons and some states have ridiculous proton/population ratios (like in OK). These facts will maximize the chances that the Feds throw the baby out with the bathwater.