Probably won't happen anything that have been said in the last hours, no rush to Berlin, Dublin, Frankfurt or Paris. The exit has 2 years ahead to happen, in this period there's time to make deals, agreements and keep almost everything like it's now, slowly changing what doesn't work. Moving people is really hard, plus London has a business mentality that is hard to find anywhere else in Europe on the tech/startup scene. Anyway, time will tell what's going to happen. Switzerland lived the exact same situation in the '90s with the fear of having companies and corporation leaving the country in favour of the EU, well, with a hard work and agreements, that have been avoided. I know not joining is far different from quitting, but still, predicting the outcome is absolutely impossibile, UK might become the hottest country for business as can fall and die, both scenarios are equally possibile.