But this means that 10 engaged, previously destined for private school pupils are now displacing 10 not previously destined for private school pupils.
DD's comprehensive used to be one that parents actively avoided. HT brought in a lottery entry, maths, music, art and sports scholarships, threw the kitchen sink at the middle classes. Now it's one of the most oversubscribed schools in the country and people living locally all complain because they can't get places at it. In order to even get on the lottery list you have to have parents engaged enough to take you to the school to sit the banding tests...
Between the aptitude test, the banding test and the lottery system it does a very good job of supplying engaged students with engaged parents.
I was delighted - our local schools are dire, so I spent years prepping DD for the aptitude tests and got one of the places there.
But I am fully aware that it there are plenty of children in the local area who don't now have a place at their local school because DD and many others like her do. And those in the local area who do also had parents who read the instructions carefully and cared enough to tick the boxes.
If a large number of children have to leave private education I would be willing to bet that a substantial proportion of those will be those with SEN whose parents were doing everything they could to manage fees. So state schools will be getting a disproportionate number of kids with additional needs - and SEN support in schools is already on its knees or non-existent.