Wolfie
Let me play a devil's advocate here.
Personally speaking, I have no skin in the game as of last Thursday, 15 minutes right after your polls closed.
It is as much a political issue as an economic one.
I agreed UK can be stronger, richer and all that overall staying in EU, but what is not clear to me is to what extent. Not all countries inside EU, especially in eurozone, are not that great, given all the benefits you brought up. Case in point, Spain, Greece etc. If it is all good why are they suffering? Something is not fitting in the picture.
That brings us to the fact that UK, more or less, has its own house in order and has her own innate competitive advantage, while the weaker countries suffer at the EU trade, ie Greece. UK was smart enough to run 5 tests to keep her own Sterling.
I think eurozone running on cheap money in one unified direction is a double edged sword. I'd rather fear a euro-exit than a Brexit. I wouldn't bet there is not a secret German plan for a euro-exit sitting somewhere. Inquiring mind needs to know. When EU, for that matter euro, dies, it would be a death of thousand cuts, a piece by piece slow-mo death.
Footsie fared better than those in other European countries, Spain and Italy worst. It showed UK's innate strength.
She would get FTA up and running no matter what. So I think UK would be much better position longer term staying on its own strength.
I'm not commenting on what politicians say.