what will be the consequences of Brexit?

Depends on alot of things. The big one being what the British people will let the elites in London and Brussels get away with. If history repeats itself Brussels along with their cronies in London will simply decide voting does not count in the EU and they will either ignore it or they will have a new vote until the people vote the way they want. If the British people show some spine and force the issue things will get interesting. It might just speed up the inevitable demise of the EU.