As a doctor, I actually support the idea of universal health care, but that is because I am an emergency medicine physician and already provide universal health care. The system will require a broad range of changes in medicine, law and pharmaceutical science.
The system must:
1. Maintain physician salaries. Cut salaries and smart students will go to other fields. I certainly would. And I dont want my urologist to be the guy that couldn't get into business school.
2. Severe changes in the right to sue. The goverment is not going to fund the current system of jackpot payouts. The cost of taking a case to trial is about $200,000 and thats if you win. The cost of my malpractice is about $90,000 per year, and that is without any judgements.
3. The goverment will need to subsidize the pharmaceutical industry. Much like industries such as defense. We will need to pay for costly research. And it will likely lead to less research being done.
4. The goverment will have to purchase all the property of the private physicians/hospitals/ labs and xray facilities. This alone could bankrupt the goverment.
5. Our current tax system could not in any fair way figure out how to distribute the increase in taxes.
As was stated before, decouple health insurance from employment. Make group rates illegal. Encourage the development of plans that allow for high deductables with HSA's (ones that dont expire at the end of the year). These things could allow for a more efficent private healthcare system. My employer pays me a stipend for being a full time employee, I use it to buy a PPO plan with a $5000 deductable. I save $7000/year for the same plan with a $1000 deductable. I put $5000 into an HSA and use it to pay for medical expenses. This allows me to properly deduct these expenses from my taxes without having to pay the 7% of my income first.
Any UHC system would have to be rolled out in phases.