The health insurance measures in the Inflation Reduction Act (IRA) will allow millions of Affordable Care Act (ACA), commonly known as Obamacare, enrollees to keep their coverage — for now. That’s good. But the IRA is the latest chapter in the turbulent 12-year saga of the ACA. As such, it represents another incremental step in the long slog to stabilize and expand health coverage in the U.S. — the only wealthy nation on Earth that doesn’t guarantee its citizens some form of universal hea...