A currency without a country?
Exactly the question, isn't it? And without a doubt it was a question on the minds of those who pushed for the Euro. They knew what an essential attribute of sovereignty it was, which is exactly why they pushed for it.
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PRECISELY - That has been part of their deep plan since their conspiring to supercede the European Common market. It has been a step-by-step strategy that has now come to a big road block. The reason it came to a big road block is due to the opposing forces here. On one side, you have the real socialist forces in Fronge, Sveeeedon, and such and on the other side you have those who have some desire for actual economic freedom such as Ireland, UK, and now Poland and the Eastern block of countries. The EU bureaucrats decided they wanted an all powerful central gubmint to control, by-dung, instead of a lose confederation of states (which would actually make sense).
The Euro was to be a stepping stone that would act as a bridge - and it was drawing them closer by force. However, the disparities between nations and their economic policies and propensities have led to currency dislocations in different countries: deficits, etc...
They it is now known they have overplayed their hand in this attempt to move too quickly on a further unification, as well as trying to move too far. (I suspect this is in part because of the desire to counter the US, rather than work with us.)
Recall that the Framers of OUR constitution essentially decided to punt on the slavery questions because the different states could not agree - and instead of deciding all questions in the Constitution, they left many of them to the states. The EU bureaucrats for whatever reason chose to include every responsibility in their central government, and little is left to the nations. They decided to fold everything into this in their desire for strong central control but there is no room for flexibility. Everyone who looks at even a small part of it will start to shake their head and say, do I really want this?
They see and understand why the bureaucrats do: more power. The People don't, though.
The currency unification was a desire to force eventual central control via necessity based on Macroeconomic Theory from day one. There were people who understood this from day one, too.
It's going to take more than just people not wanting it to happen. They'll have to want it not to happen, and they need to get very active in making their voices heard. The politicians are most assuredly not going to be proactive about it just to get votes. Both major parties in nearly every country are in favor of the EU, and they know that the electorate is pretty much stuck with them, unless the voters are willing to go off the board and vote third party. That's not usually an attractive proposition, even in European countries. True it is that third parties generally do a little better there than here, but even then, most of them are separate parties in name only, and in reality just attach themselves to some larger coalition. It's pretty tough to get a vote in edgewise, when your goals are different from the goals of the political establishment there.