I disagree. Large and seemingly intractable institutions can and *have** lost their legitimacy overnight. Some examples are slavery, the Protestant Reformation, the American Revolution, the fall of absolute monarchy, Jim Crow, women and the vote...etc.
Nearly every state in the Union ( all?) have some form of charters, vouchers, and tax credits. The waiting lists are enormous for these programs. The legislators are not deaf to the cries and pleas of the families. And....The biggest factor is the state budgets. Vouchers, tax credits, and charters are the quickest and most rational way to balance the state budget and get from under the thumb of the teacher union benefits and retirement.
Also...Taxpayers are sick of the high property taxes ( in some states as high as one parent's entire take-home salary) to pay for government schools that teach atheism and Marxism and fail to teach basic reading and arithmetic.
I am very hopeful.
Besides....It is now becoming common knowledge that it is impossible to have a religiously neutral education. Secularism in our government schools is nothing more that government established religion of atheism. Parents and taxpayers are sick of it.
If you think about it most of the radical changes you mention really took decades if not centuries to truly come about. Most of them involved long bloody wars.
Also...Taxpayers are sick of the high property taxes ( in some states as high as one parent's entire take-home salary) to pay for government schools
Even the end of government schools is not likely to end property taxes. If you replace government schools with private schools you will likely still have property taxes to fund vouchers. In my state property taxes pay for many other state and local government functions.
I think getting rid of government schools is a worthy goal, I just dont think it is a near term goal. The reason I mentioned the USSC before is because that it the only even remotely likely way I see of ending government run education. There are simply too many deeply imbedded interest in public education.