I would like to think the the government and people would not want to give up economic control, but this has already happened to a degree. Britain could not, for example, decide to remove import duties on American products, because that would breach the common tariffs laid down by the EU.
We've already lost control over essential areas, e.g. the common agricultural policy and the common fisheries policy, both of which have been total disasters for Britain right from the start.
Given that the government seems quite happy to throw away its citizens' rights by allowing EU law and foreign courts to override British Common Law, I'm really not too confident that they'll have our interests at heart over the euro debate.
I'm against it because its a stupid name.
And have you seen what the notes are like? Ugh!
The money in my Monopoly set looks better than that!