How is losing the UK a speed bump? They were poised to be the #1 Eurozone economy in 2030 and perhaps the most populous with also the #1 or #2 strongest military. It is the end of an era because the UK and thw rest of Europe are not rejoining anytime soon. If anything Germany needs to start envisioning a plan for a future where the EU itself may or may not exist. Geert and Marine Le Pen may have lost, but they had better numbers with younger future voters than older ones and the anti-EU sentiment is still there in a lot of states. Italy is still struggling with migrants with little to no help, countries like Poland will not bow to threat of sanctions and take any etc. Walls and borders going up between Autria and Hungary and Serbia etc.
Then it seems we are looking at a war, due to the selfish and powerhungry politicians. If that happens, may the planet have mercy on us all, as Europeans tend to go all out in their hatred for the other once they do war. Ask any former colonial state on how far Europeans go in destruction, ask the Germans about the French after the First World war. Ask the Flemish about the Germans during the second... the list goes on and one.
Due to that reason, Europeans, and their hatred being so easily fueled, will have no qualms about using Atomic weapons on each other. But.. for a short moment, we created a "feeling of traditions and safety" for those happy to live and die in their houses and envious on anybody who dared to travel to the point that they want to make it impossible. Remember these are people that put their own neighbours in concentration camps to be "destroyed", and no ... I'm not just talking about the NAZI's here. In Norway we put the lovers of German soldiers in camps for a while for instance.
We Europeans just LOVE to hate people.