Well, someone agreed to a health care deal. CVS Health, which operates drugstores across the U.S., has agreed to buy health insurance giant Aetna for $69 billion. The deal could reshape a medical industry already in a state of flux over rapidly changing technology, uncertainty in Washington and new players like Amazon elbowing into pharmacies’ territory. CVS hopes its Aetna merger, plus new audiology, vision and nutrition services, will make it a one-stop shop for health care. But critics warn that consumers could find their choices curtailed.