Oh dear, back to the old stereotype of the Leave voter as narrow-minded Nationalist who harks back the glorious days of the past. I remember having that one levelled at those wishing to Keep The Pound back in 1995, mainly by far-sighted Liberal Democrats who said we must join the Eurozone or have our economy left behind. Nothing could have been further from the truth, both in the accusation or the outcome.
I saw The Guardian were touting the same sort of stereotype going into the Referendum. It makes me very angry that some people who, quite rightly, would condemn the use of stereotypes against other groups seem happy to use them against Leavers.
I think the question of countries leaving bigger groups might be usefully put to Scottish Nationalists. If we look to history, how about the USA leaving the British Empire or, indeed, any relevant Commonwealth countries who have gone off on their own? Of course, New Zealand didn't so much go off on its own as, economically, were set loose by the UK when we joined the EEC.
I would not argue that leaving the EU implies a level of risk but so does staying in because it is headed to an ever-closer Union which implies further loss of sovereignty. Many of my friends who voted Leave (and I have as many who didn't) did so because of the sovereignty issue and a vision of the future, not the past.