Well, language barriers I can understand, in some countries ppl. just refuse to either learn or to speak English.
Let alone to learn any other diffrent language. Dutch schools teach their students a lot more languages then just English.
Politics are also a problem since some countries now have a socialist/green government and others (like mine) have right-winged governments.
Also another subject that will cause a lot of controversy is the fact that Holland has cut their budget for asylum seekers with 90%
Meaning that other EU countries will be overwhelmed with ppl applying for asylum because they know they will stand a far lesser chance of getting a status in Holland.