Is the push to change how "dual eligibles" get their healthcare going too far, too fast? That's a question that’s beginning to be heard from lots of quarters—including the Medicare Payment Advisory Commission, the American Medical Association, some analysts and now at least one key lawmaker. But criticism toward a Centers for Medicare & Medicaid Services-led effort to do just that has been rising. MedPAC recently raised a number of concerns over the size, scope and rapid pace of the program. Sen. Jay Rockefeller (D-W.Va.), who helped shape the effort, has called for its immediate halt.