Regarding moving teaching on line, for my original degree / post-grad qualification, the OU worked brilliantly and I was lucky to have excellent tutors, a combination of summer schools, classroom attendance on weekends and towards the end on-line - I wanted to learn, so had the motivation. Sadly, my more recently experience of the OU failed, as the tutor lacked interest (and said some of this was due to their experience with the OU system) and experience, far too much reliance on the virtual, with little interactive engagement and frankly, boring support materials.
As for schools, there are a multitude of issues, educational and societal, that need addressing and funding is just one, as is wage stagnation, which is an issue that means many salaries, in far too many occupational sectors, have lagged for 20 years now and counting!
I counted the students in my primary school class pictures, from the 60s / 70s and all of the classes were in the 30s, so class size is not necessarily the issue and we never had a classroom assistant in any of the classes. Trying to educate a mixture of needs, abilities, in a class is and one size does not and will never fit all, even if a child has a statement and my niece, who is training to be a teacher, has been told, in no uncertain terms, that delivery in the classroom has to be delivered so that those at the bottom can participate, which is causing a problem of disengagement and boredom for those that need more!
We know that we have great teachers who go above and beyond, but having been a school governor, I also know we have an issue with the quality of teaching staff too and it can be incredibly difficult to deal with a failing teacher, especially if a local authority is involved! We have increasingly to support students with issues of poverty and no student learns well when they are hungry etc. There are also issues of behaviour, bullying, expectations or lack of, from both students and their parents, who have a part to play and often don't.
A friend's wife, highly qualified and with a degree in Maths, is a teaching assistant and often takes classes or steps in to deal with the class, as the support teacher (school in a very difficult area with high social deprivation) strugles to control the students or engage them with any activities in the classroom, that's if they can get the students into the class and they have now taken to knocking on doors to get the parents to bring their children into school! Privately, she also tutors students up to the age of 18, due to her knowledge. She has no desire to be a teacher, as the additional duties imposed on them are so onerous she'd have no home life and she knows how difficult the role is when you spend more of your time being a social worker than a teacher.
There is a lack of roles for newly qualified staff, but not for teaching assistants, which is indicative of schools and local authorities trying to get more for less, but then failing the students and having to find money to deal with the issues post 16! Check out the local authority job boards and you'll see the issue.
Our politicians, governments, local and national don't care enough yet, but perhaps things have to reach critical to get things to change, which I fear is going to be sooner rather than later.