From the viewpoint of a medical practice, this could bring additional business.
It has already been suggested that Medicare and Medicaid benefits will be reduced to finance a national plan. That would be a good indicator of the direction they desire. If I had to guess, initially, they will develop a subsidized alternative insurance plan that most businesses will eventually, if not immediately, embrace. Keep in mind that HMOs are traditionally more expensive for the consumer than PPOs, and most likely would need to adjust to survive. PPO's could survive, but it is impossible to predict at this point and is beyond the scope of our chat.
So you will have a large realignment in the insurance providers, albeit with far more oversight and spending caps, but you will bring the otherwise uninsured into your office. Everybody wins here: the medical business, the uninsured, and everyone that currently has private insurance...oops.