I really do believe this is going to be one of the unintended consequences of government meddling in healthcare is there will be a breaking point at which more Doctors are going to be better off not taking the government as a payer any longer.
Bureaucrats are so used to businesses fighting for access to a government teat, their model fails horribly when businesses do the math and say no instead.
There was a recent article about NYC Doctors that are refusing third party payers all together (I believe linked here); for a variety of reasons there will be more of this, not less.