Depressingly, it may not be as simple as that.
FWIW, here's my take on what will happen;
1. In the event of a 'remain' vote, we may as well all pack our bags and emigrate to Syria, because the weather will be better.
2. In the event of a 'leave' vote, the following will take place;
(a) there will have to be lengthy negotiations on leaving arrangements;
(b) at this point, EUrocrats, French farmers and the rest will be up in arms because they will suddenly realize that one of
the teats on which Europe has been sucking for so long and so freely, is about to be withdrawn.
(c) Under immense pressure, Hollande will offer our little puppy-dog of a prime minister a little biscuit, which will be a
5% reduction in the gazillion pounds we pay annually to stay in the club.
(d) tail wagging, the puppy dog will bounce back to London and tell us that we are staying in after all. The results of
Referendum will be declared null, because the 'terms' are now 'even better', so we will be staying in after all.
(e) The Tories will loose power at the next election, there being no overall majority for any party. Cameron will be deposed
but will have a highly-paid seat on the board of News International, and will eventually end up alongside Neil Kinnock
with his snout in the Eurotrough.
You read it here.