A new health care reform bill was just emerging when the Greater Hall Chamber of Commerce tackled the thorny subject in a community forum six years ago. Since then, the bill became the Affordable Care Act — or more popularly, Obamacare — and has survived major U.S. Supreme Court challenges, including one this year involving tax subsidies that could have dealt a serious blow. So as the chamber prepares to hold its annual update on Aug. 25, the law is looking more and more entrenched.