The question's not that difficult, and the answer is simple. Simply painful.
At some presidential or gubernatorial debate this needs to be asked: "If you've got a plan to provide health insurance coverage to most everybody, what's your plan to ensure there are enough doctors and hospital beds to treat most everybody?"
Unless I've been watching too many "Got milk?" commercials, the only possible answer is -- we can ensure coverage, but we can't guarantee access to care.