The plan I outlined is not wishful thinking and is already working. Vouchers, charters, and tax credits are increasing every year. Record numbers of children are be educated outside of the grip of our nation's K-12 single-payer schools. The reason is that pressure from the voting public has forced legislators to provide these alternatives. It will continue to grow.
In my state there has been a flood of children who are nowusing On-line programs. Yes, they are offered by the state but they are run by privately-owned companies.
What is needed is **less** control from state agencies and school boards and more opportunity to choose private alternatives. Do this and the reforms you seek will naturally follow, as well.
The plan I outlined is not wishful thinking and is already working. Vouchers, charters, and tax credits are increasing every year. The wishful thinking was the complete elimination of all public education in one fell swoop, as your post stated but perhaps was not what you meant:
I have a better idea. Complete separation of school and state! No interference! None!
At least that is how I interpret a post like that, as not a means but a goal and completely unrealistic. As to vouchers as an intermediate step, Friedman proposed that fifty years ago and we're still not up to 5%. I'd call that an ineffective plan.