I would argue that the very reason the Euro was created has now gone. It was a political move designed to unite all the member states towards The United States of Europe.
That can now never happen and a two speed Europe is a reality with a third of members holding on to their own national currencies. I also doubt in future any new members such as Croatia would want to be part of the Eurozone or could qualify for it.
So that begs the question, what is the point of the Euro now?
The sooner it’s gone the better and all EU states start a return to prosperity governing their own economies.