I doubt the EU really will collapse, as they all like to claim, if the Euro hits the buffers.
Any business of any size (even my tiny one) has to deal with different currencies. One cannot just export to the Eurozone. So "business" will take it in its stride.
I think the real reason Germany is desperate to hold onto the Euro is because they get a massive export advantage from the exchange rate at which they adopted it, currently resulting in ~50% of their GDP being exported. This has enabled them to make loads of money by flogging BMWs and Mercs to the newly-rich southern European countries who were having a fantastic Mexican party on the money they borrowed from German and French banks
When the dust settles, you will have a pile of BMWs and Mercs parked around southern Europe, and the income, VAT and corporation taxes paid by the German and French companies during the heyday will have been partly used up to rescue the banks whose money paid for it
And southern Europe will revert back to its traditional existence, continuing the massive corruption, only this time a lot of them will be poorer than before because those who should be taxed cannot be for the most part because they have fingers in all the pies.
Weird how the world runs
I don't see EASA stopping their quest to dominate the place with pointless regulation.