Single payor sounds good unless that payor doesn't pay you for 3-6 months due to rule changes, computer errors, address issues. I have had medicare not pay for 3-6 months at a time twice in the last 4 years - once my post office returned mail with my street address since they only accept box numbers (bear in mind medicare would not take PO Box numbers and my town is small enough that Dr. _____ would get it to me normally) and the other when medicare changed the rule on what to put in BOX 34 or something and then changed it again after we rebilled 1 1/2 months of bills.
I don't know about the rest of you but if they were the great single payor I would be hurting if all my bills were denied... I do not believe there is a great solution for this. The issue of socialized medicine and what they do in other countries is always brought up but americans want everything and don't want to pay the tax rate to get it... something for nothing doesn't work.