I've seen the prediction, which I think is tremendously plausible, that there won't be a "big bang" Brexit disaster, but over a decade or so we'll forget that the UK used to be more prosperous than France or the Republic of Ireland, and it will start to become more normal for young people rather than moving to London to get jobs, start applying for work visas in the rest of Europe.
It's the only way to get net migration down: persuade people to emigrate by depriving them of economic opportunity.
Edit: note that people who are married to EU nationals do not automatically get the right for their spouse to remain, so I expect a few hundred thousand people to be forced to emigrate for that reason.
If you think the EU is a cage, but requiring visas for the continent is freedom, what really are the bars of the cage?
I'm a Scottish nationalist, and as such have learned that shouting "freedom!" out of context gets you ridiculed. It has to be freedom to/of some things specific and valuable.