This.
It's not the super rich that will leave or no longer consider private education, but those for whom it is a bit of a stretch.
If our kids were little, we would not send them private, but they are nearly through so we'll grit our teeth, tighten our belts and pay the extra.
And the kids that will stay are just very very wealthy. And international boarders.
I used to feel really guilty about sending our DCs to private school. I would keep my mouth firmly shut when randoms would happily opine about how awful private schooling was, and how having our kids do a long commute to a brilliant school where they both had scholarships was tantamount to child abuse (I kid you not).
But the addition of VAT and attitudes like the OP have completely obliterated any sense of guilt that I have. I'll still keep my mouth shut because I'm not a dick, but I refuse to feel bad about our choices.
But I must admit I now I no longer get that guilty twinge when I'm walking into the beautiful theatre, or chapel, or swimming pool, or recital hall or all the other wonderful things that my kids can take advantage of. This is in no small part because the Rachel Reeves does not count my kids as "our children".
And this worries me. Because if the politics of envy displayed in the OP can turn a wet liberal like myself into someone who is less apologetic about privilege, what on earth is it going to do to people who had even more of a sense of entitlement? I suspect it will entrench feelings of entitlement even more.
And as the PP says this will make them even more elite. Which is not good for anyone.