True. For governments to compete for citizens requires freedom of movement. Living standards and job opportunities would be how they would compete then.
agree, greater freedom of movement would force them to be more competitive & thus improve.
An alternative would be smaller competing states. & because (actual) free trade allows open societies to out compete closed off societies the world would become more open.
the risk is that “bad” people can be shut out of the entire system (blacklisted) with no where else to go. Much like billions are shut out of the banking system now.