IMO this is half-measures. You wanna a strong EU? Merge the salaries and living standards from the north the south and west to east. Germans workers shouldn't blackmailed by auto-motive companies leaving for Poland unless they accept smaller salaries and vice-versa polish workers shouldn't emigrate to Germany to find a decent salary, pension, etc. Flat out these social differences and you'll have the social support y…
Is it? I doubt it. There isn't a large country on earth where the salaries don't differ across regions.