This violates basic Western constitutional rights concerning the freedom to travel. So, no doubt, black market travel is coming soon. I know a guy who came to Canada in the 1950's as a crewman on a merchant ship. He got off the boat in Hamilton Harbor and just walked away from the merchant marine. Just like that. Started working cash jobs and built everything from there. He's pretty old now, worth million and millions. Big family, etc. There's too much transport going back and forth to be controlled. The best they can hope for is regulating the major flows. There's always another way in. Always somewhere nobody is looking. The more you regulate, the more profitable black markets become.