Obama's answer about keeping one's doctor was correct, but it was NOT a good answer, because the ACA , as far as I know, was not involved in personnel decisions.   Any doctor now  -  as before the ACA  -  might retire, die, become ill or request a change, and any provider. like a clinic or hospital, could hire, fire, move or upgrade a doctor at its own discretion......so whether or not one could keep his doctor (or his program) was up to the provider, not a feature of O'care.