This is all a big pantload.
First off, most of these so called negative effects, markets etc are going to go back. This is all temporary.
France now has a larger economy? Is it producing more goods and services than last week? Hell no. Is the UK producing fewer? Nope. This is all relative currency valuation. And the real irony? Everyone has been deliberately debasing their currency in a race to the bottom. According to current dogma, a weaker pound should be wonderful. But because it is happening via Brexit, oh no, the sky is falling.
Bingo! I just made a similar post.