Re: parents v yeshivos. Bava Basra is still correct in the conclusion that most parents are not capable and we need public (Jewish) education. So, I am not talking about wholesale abandonment of a working system for something else unproven. Still, modern society allows personal flexibility in a lot of fields and it is natural to do same with the most important – Jewish education – where possible. If this would work for 10% of population, it will be huge for those kids, and then you’ll see what to do for net 10%.
In this sense, this is the same issue in both general and Jewish communities. And obstacles are often similar. In our experience, we were first simply monitoring quality of the process and schools admins would react when we had reasonable issues with teachers, either by dumping bad teachers or moving them to less complaining classes. When we felt we need additional changes, there is a roadblock that principals were frank about: “what if everyone will ask for that”. So, it is institutional aversion of risk v. parental concerns about the kid. Both can be unreasonable. Maybe we need batei dinim that will determine what is reasonable. When I consulted several Rabbonim, not being sure that I am right on insisting on something, they often just commiserated quoting their own school experiences.