And return to being a backward country where the people live under a regime that regards them as nothing more than worker drones to be used and discarded to make profits for others.the strength of the Euro is exactly what the Southern Eurozone countries cannot afford, they need a weak Euro to create more jobs.
Sooner or later, one of the Southern countries will have to leave the Euro or endures very high unemployment rate. That may eventually lead to a smaller Eurozone core. The Eurozone will be the pillar of the US of E if the EU ever becomes a superstate. Nobody can predict the future of the EU when the first country (which may be Greece or Italy) decides to go back to their own currency.
As long as we keep a flexible economy, we'll trade successfully with the EU in whichever form.
Any fool can run a slave economy to make a profit, but that isn't progress and is doomed to failure, already mismanagement and exploitation drove the Public to vote for Brexit in the Referendum.
The notion that had been sold to them was that the EU was the source of their woes, when they realise it wasn't, a referendum is unlikely to pacify them again.