Lol, what do you think?
You think there will be no consequences if you leave EU? Of course there will be. First we'll kindly let the thousands of migrants that want to join your country go. Why should we step in and help you if we're no longer allies?

Then we'll tax any importation from UK. That's the whole point of EU afterall, freedom of exchange.

And you'll be let behind in the scientific research because UK alone has nothing to give to the world. Most of your scientific education is just a big fat joke, which is why UK companies are actually hiring French engineers ^^