No need to apologise, I know you have a thing with apparent contradiction
Allow me to try and clarify.
If the UK votes Brexit, then as with other countries who have voted for an exit they will be told by the EU to go away and keep on voting 'until you give the right answer'. IIRC this has happened twice already, France and the Netherlands. So in a way a BREXIT vote would be unlikely to change anything, apart from create a lot of upheaval. The blue-print for the EU was laid out in the 1950s, and I can't see anything that would alter the politician's course. That end-goal can never be achieved via honesty/democracy.
What the market takes note of is facts, perceptions, anxiety and so on. The possibility of the uncertain fall-out of a BREXIT vote is enough to seriously freak the markets out. They have already adsorbed all the knowns + a large amount of the unknowns. A BREXIT outcome is already perhaps ...? ... 75/+% priced in. That is why you can expect the mother of all relief-rallies in the event of a BREXIN.
But if the vote is BREXIT and stays that way then the ramifications are perhaps wider. No more 'Hotel EUrophornia', an establishment that you can never leave. So the bigger issue won't be how the UK might cope outside the EU*, it'll immediately be 'Who is this going to motivate to try and quit next?'.
* And as per any other country that's suggested they might leave the EU Germany has a habit of sending the tanks in, Greece, Spain, Portugal. In fact Spain has elections on 26th June and their PM Rajoy was installed via orders from Berlin. That's going to be another interesting vote to follow... (IIRC Italy's PM Renzi is another Berlin place-man). I don't think you can believe in democracy and be pro-EU - how do you reconcile that?