No one has any data one way or the other, and will not for at least ten years. The UK entered uncharted territory. Your guess regarding what the future holds is about as good as anyone's, including those of the experts.

People are sick of biased crap and vague economic theory being touted as data telling them how good immigration and free trade is for them, while in their own lives only seeing things getting worse.

Nassim taleb sums it up well: http://reason.com/blog/2016/03/15/nassim-taleb-the-global-re...

There's more to wellbeing than (relatively) short-term economic wellbeing.