"...North Korea of Europe..."
Like Switzerland that well known third world country?
This is getting silly.
From the top - if we vote out we've 2 years to negotiate all this stuff. I expect some of it to pass on the nod (because it's in no ones interest to fuck it up completely) and some of it will turn into a right pigs ear (because the people involved have previous). Neither the rose tinted wish fulfillment of the 'leavers' not the dire predictions of the 'remainers' will come to pass.
Yes there may be some countries that want to cut up rough - I expect that the self defeating nature of doing so will be pointed out to them by wiser heads. In the event of a close vote (and given the EU's behaviour to previous referendums) I would not be surprised for there to be an attempt to move the goal posts. I realise that would be against its own rules but that has never been an obstacle in the past and doubt it would be in this case.