Obviously there are many people who see a Federal United States of Europe analogous to that in North America as desirable, and express their hope to achieve that. There are people who would hope for a World Government. There are those who plan for inhabiting Mars. But none of these ambitions are at present close to coming into existence, and they can't come into existence, if they ever do, until a lot of things have changed.

UK membership of the EU in no way involves a commitment to such a project. In fact it is a major block on any developments in that direction. For anyone wishing to achieve a Pan-European state, Brexit is clearly to be desired. The evidence that there is general opposition to a British exit within the EU is evidence that it is absurd to see talk of this dream as anything more than a fantasy in this time.