Like many of us, I prefer to deal in facts, not surmise, assumptions, or what might be, or might not happen. The truth is that neither side have a clear idea of what leaving or remaining in the EU might entail, except for one clear fact.
This is, that if we remain, we will continue to have no control over numbers of immigrants from the EU, entering the country.
We all agree that immigration is a Good Thing, but uncontrollable immigration is another issue completely.