That's the question that should be asked, as I said, to BOTH sides. As an onlooker, 1-2 years my impression is "exactly how it is whichever side wins". Five years? Then things will be coming unwound and the effect will be more clear - I don't know what it will be.
I'm not promoting Remain or Leave, so I'm not in a position to answer your question. Both campaigns should have a clear idea of how they think will pan out, without just talking about single issues like immigration pressure, effect on sterling, trade, banana curvature, etc.