No one expects these things. And I can't see it for a few years. But ... if the EU members starts falling like domino's, Europe will look very different in a few years time. Tensions with Russia (Ukraine?), the rise of regional independent movements (Catalan/Spain), the continued rise of the far right, reactions against increased terrorism, etc. Anything can become a touch point. And it all seems far-fetched until it happens. Cost of EU: Billions. Cost of War: Everything.
And your "abusive" quote is way off also. It's not about abuse, it's about, as per any negotiation, either side will try to extract as much value as they possibly can. And if there is a power differential between the participants, the one with the upper hand absolutely will make the other party pay a price, and if accepted, it will be a fair price per the market.