In some countries and some quarters there are also fears about the immediate forfeiture of sovereign rights, as in the case of the currency, and also about an uncontrolled dynamic integration process which will - automatically, as it were relegate the nation state into the background.
Here in the U.K. (but not only here) there seems to be some concern about an uncontrolled political integration drive in Europe: the fear of a “superstate of Europe”. Even if this fear is manifest to some extent in continental Europe, too, there is, at the same time, rather, more concern about an uncontrolled economic integration drive caused by increased competition.