Wrong. Lots of doctors will change jobs. They can get salary positions or go to the US or overseas. A 10-20% drop in a business could mean laying off a medical clerk. It will be more difficult to attract doctors to work or locum in the practice. Less $ for overhead = longer wait times, more clerical error, delayed and worse medical care. 

Doctors have a low threshold to close a business because what they are taking home from the business is going to be compared to the market price of their services. This could result in many GPs moving from a rural managed practice to a larger urban group practice where they don't have to worry about balancing the books.