Sounds a tad paranoid to me. “A continent -wide army”? With respect, that sounds like something Paul Nuttall would come out with. The idea that Germany, France, Holland etc would be some kind of military threat to us in the future? Come on! The fact of the matter is that the UK have made their choice, after 45 years of EU membership, most of which was spent moaning and whining from the sidelines, constantly trying to baulk and block perfectly sensible measures that the rest of the 27 members were trying to implement. One of the more recent, and probably most outrageous examples was Chancellor George Osborne being the only one voting against a proposal that banker’s bonuses should be restricted to no more than 200% of their salary. But fair enough, we have made the choice, democracy rules.
Merkel is just being pragmatic, she has now had the up close experience of Trump and little Theresa desperately clutching his coat tails and thought, nah. This is not for us. And who could blame her. The UK has made it’s choice, in our wisdom we have left one strong alliance, the EU, and thrown in our lot with Uncle Sam, standing shoulder to shoulder with our new allies, Saudi Arabia, Turkey and Israel. As you say, “what could possibly go wrong”!