Well this is a tricky thing.
I suspect that Brexit is gonna be a fucking disaster. People will lose their jobs, services will get worse, medicines will not be available etc Some people will, I hope, realise at this point that they have been conned. You know I can see this kind of scenario where someone is saying let's do x and they're told they can't cos of Brexit and they're ok then how about y and the reply is yeah we used to do that... and eventually the penny will drop. Of course there are entrenched people who will neve ever be persuaded by this or by anything. But that's the case with any issue - ignoring Brexit there are True-Blue-Tories who will never be swayed. I mean we saw that in the election with those people saying "Public services have got worse and worse, this has been fucked and that and so on" "and who do you think will fix it?" "Definitely the Tories" - it just doesn't make sense. But the point is you can't win round the unchangeable so you have to concentrate on those that can.
But there is another issue here. I can't hope that Brexit is the failure that I predict. I (weirdly, for my sins) actually like Britain (and hate it too of course) and I don't want it to go backwards, I don't want my friends and relatives and so on to suffer, so I have to hope Brexit is not as bad as predicted. In which case maybe it didn't matter so much.... I just don't think that is going to happen.