One of the main economical considerations - we don't understand why would we return to the USSR model, when the rich and hardworking regions must donate poor and lazy ones. In USSR it was the mad worldwide spreading of Communism that took and buried all strengths in vain, in EU case the Transnational Companies' high top management cheats and harvests the profits in a rudely veiled way, while the workers of donor-countries are milked harder. I do hear in EuroNews all the way as industry enterprizes, factories leak to the Asia and leave next few thousands of workers without job - that process wind up slowly. We see from aside this myth about the so-called post-industrial society and well see what China does.
Tell me, what do you suppose Danemark has definitely won from EU-membership besides common words about new pan-european identity, what the Switzerland hasn't?