you have to consider the costs most of us are paying for health care now in that tax equation. Taxes increasing would be necessary, but the break point for reasonable people is when does it start to take expendable income out of your pocket?
If a single pay healthcare system ups my annual taxes by $3,500 but my annual outlay for healthcare that would be covered by the new system is $5,400, there is a net benefit. The anti-tax types will point to a huge tax raise..."unprecedented increase, taking YOUR money from you!!!" But if they take MY money and provide me a service cheaper than what I am paying on the open market for healthcare, and the national single pay aspect creates no-fee (not no-cost...no-fee) preventative maintenance for those below the poverty line who make up the largest population of those who go with no or catastrophic only insurance that costs us in indigent coverage after major illness that was preventable/could be mitigated by regular care? Now,I am seeing savings and the cost of operation could see realistic decreases as the general public becomes healthier?
That's what matters. And if the tax rate remains graduated, and this is paid from an increase of income tax, not sales taxes or usage taxes, then the cost is carried by those who are likely paying out the nose for healthcare anyway, and would be happy with a net decrease.
And, quite frankly, the argument of freedom to choose care/providers is largely a joke with limited numbers of doctors taking new patients/HMO/PPO based plans requiring referrals, etc. Or, even worse, you are charged monthly by your employer for an HRA account that they spill less than $100 a month into that is 80/20 up to $6000 after the HRA funds are exhausted (which occurs at $1200 for my major bank employer), so I pay $240 a month for the right to pay 80% of my bill after $1200 and up to $6000. So my medical costs depend on the calendar...when my kid blew her ACL in November, I paid to the deductible for that calendar year, then her rehab was a new calendar year and I got to run up to my deductible again. Then I am still paying 20% after $6000, so...yeah.
I could bear an increase in my annual taxes of $4000 a year and still come out ahead if it meant I no longer had to pay premiums or out of pocket.