The US Treasury Secretary is joining the EU Finance Ministers to tell them to sort out their ramshackle currency. He has bought his place at the table, by pledging Fed money to European banks in trouble. The dollar fix deals for the moment with the dollar liquidity problem. It does not resolve the sovereign and banking solvency problems in the weaker cases.
I see the UK also has dollars to offer. I trust the Chancellor, having bought his place at the table today, will demand something for the UK in return. Getting us out of all the arrangements for economic and financial governance would be a good start, but I doubt this will be raised.