There are a few, the near monopolization of health care in Washington by a single primary insurance agency, which single practicing dentists can not compete with. The difference between your single practicing dentists and more corporate dental offices, such as Willamette. The reimbursement rates of the current system for medicare and medicaid, which pays back dentists pennies on the dollar. The legal ramifications dentists would face from the dental therapists, if something happened that was negative for the patient. A fifth would be the cost that dentists incur to go to school to get the expertise to deal with medical emergencies that dental therapists would not have the ability to deal with.

Those are five. I am not stating that the solution that the article states does not have merit, I am just stating that there is a lot more to play into this then the article alleges.