That's completely melodramatic in all honesty. The EU are just as concerned about the World's 6th largest economy leaving. (I read that it's the equivalent of 27 smaller member States leaving). Germany is now in recession, Deutsche bank is on the verge, France has been protesting for nearly a year, Italy is now doing separate deals with China, Hungary and Austria has swung Politically to the right......that's without mentioning the last EU parliament election results. The globalists neoliberal project is leaving too many people behind. It's falling apart.
My main concern is swapping one set of globalist neoliberals for another, albeit UK based