The EU isn't in a mess at all. Indeed, back in 2016 when Johnson was spouting his nonsense about WW3, the root of concerns about the health of democracy in Europe was due to the rise of people like Le Pen and Wilders to join Orban and Babis in eastern Europe. As these despots all largely approve of Brexit, there was a fear that a leave vote would add gusto to their campaigns and lead to a dramatic lurch to the fringes across Europe.
Thankfully, that hasn't happened as the Tories have made such a pigs ear of the whole affair that it's strengthened the EU rather than weakened it, and support for far right nationalists across the continent has weakened, with Macron winning in France, Rutte in the Netherlands and Merkel being voted back in in Germany. That's not to say that the threat of the far right has gone away, and indeed the AfD made big gains in Germany, Wilders was 2nd in the Netherlands and Le Pen made the final round in France, but merely that the immediate risk of Brexit causing the breakup of the EU has dissipated.
Interestingly, I read a study recently suggesting that support for more extremist parties tends to be highest during periods of relative economic calm, as people feel emboldened to gamble, which if a recession is looming as many predict may have an impact. Of course, you could equally argue that recessions prompt people to lash out as they have nothing to lose. Time will tell I suppose.
