The EU as we know it is the EU with the Schengen area, free inter European movement and choice of residence. The ability to work and live anywhere in the Union. The Union without border controls. This is very much at risk due to the unwillingness to curb economic immigration.
The immigration crisis is caused by liberal dogma and capitalist desire to maintain poverty wages, which are being suppressed by the constant influx of desperate laborers who are willing to work for crumbs. The new arrivals are not properly integrated into their host society, neither on an economic nor a cultural level, causing subcultures to form that feel no longer affiliated with the greater society as a whole.