The nation's new health-insurance exchanges, the online marketplaces for medical coverage that are an integral part of Obamacare, opened for business last week. Immediately the trouble began. Webpages went blank. Attempts to enroll in coverage were delayed, or altogether stymied, as sites crashed. Critics of the law pounced. "Too many unanswered questions and too many unsolved problems," said U.S. Sen. Orrin Hatch, Republican of Utah. Yet there's another way to see these growing pains: as evidence not of change but of continuity for consumers of health insurance in America.