All of it; what the Brits allegedly predict, and the idea of forming a core Europe. Such a still-born posited core would be France and Germany alone, along maybe with the nuerotic Belgium, the land of the one of the most unhappy folks on Earth. Who else in Europe would not to march to that drummer, particularly given how disgustingly self centered the French are. Rules are for other folks, which is the French violate EU budget rules without breaking wind.
not to march = want to march
I'm sure that the 'core Europe' they would try to form would be: France, Germany, Benelux, and Italy (the 6 founding members) plus I think Spain and Portugal. I agree it'd be stillborn without all of them, and I don't think they'll be able to work something like that out unless the EU falls apart.
As I'm sure you know, a number of the European states are at a crossroads with regard to the transnational experiment, and it's not very clear how they're gonna play out. The expansion was a disaster IMHO, because it was governed by political rather than economic rationales. They will now pay the price..