Regardless of the political title one holds, isn't there really some upper limit to how many people can take up residence? If untold millions of unskilled people move in to utilize the resources, wouldn't something relating to survival eventually break down? I'm no expert on the EU immigration policies, but common sense says that there must be some limit that will be breached in the future if no controls are in place.

even though some states have suffered more than others in the recession. And that's among states speaking the same language; there aren't that many jobs to go after where proficiency in the main language of a country isn't an asset, so 'untold millions' are unlikely to move between most EU countries.

A lot of people won't move for job prospects because of family ties and commitments - children in schools using their native language, relatives to help look after, and so on. And the cost of living in more prosperous countries tends to be higher, so it's not worth moving unless you're confident you can find a decent-paying job.

(California and Florida pop to mind) have been popular destinations of people moving from other states. There are ways to deal with the effects of population movement (whether to the UK and Germany or to California and Florida) without building walls (physical or legal) around them.

My impression is that the principle of the EU is 'we are all on this continent together'. The idea is not to keep your problems and your poor away from us (because history shows that they do not state within national borders forever), but to eliminate poverty and war on the continent. The concept has worked well for decades though some people naturally resist the softening of the concept of national sovereignty.