In reality, staying in or leaving the EU is a lot more complicated than a simple two-way choice. The two most obvious paths for exit - leaving the free trade area altogether and somehow joining the EFTA and retaining free trade - have less in common with each other than they do with remaining in the EU. Then there's the issue of what to do if we can't meet the Leave campaign's promises, which seems almost certain as they're self-contradictory and beyond optimistic, but couldn't be guaranteed even if they were more reasonable since so much depends on negotiations with the rest of Europe.