Lots of surprises coming up for the island if they leave, that's for sure. And saved money for us mainlanders, at least the central European Net payers, so I guess loose/win situation ^^ .
I still remember the discussion about Scotland leaving the UK. Well, UK said all contracts will be re-negotiated and some things even would not belong to the Scots(oil for example). So, guess what will happen if the UK leaves. Of course all agreements are void. Everything else would not shine a nice light onto our good and useful EU politicians. And they want to be re-voted next time back home...