Look, it's a well known fact that if we leave the EU, the Germans, French, Italians etc. would immediately punish us by refusing to sell us all that lovely stuff they make and keep it all for themselves...
As I see it, the EU would be down the UK's net contribution to it and the remaining members would either have to pay more in, take less out or do both.
The EU in its current form is like a giant supertanker sailing off to a destination which doesn't want its cargo. Despite what he's being told, the Captain refuses to accept it and won't change course despite almost reaching the point of no return. Meantime some of the crew, sensing trouble's ahead and they're not gonna get paid, are getting increasingly frustrated and considering jumping ship.