I'd rather have a stagnant economy than 50 million third worlders on welfare for the remaining U.S. population to support. Drive through the middle of the country and you'll see that most Americans there have been replaced by hispanics. The U.S. can't replace it's population with third worlders and remain the same country, we'll cease to be a superpower and become a facsimile of Brazil.
Let's see what happens in 20 years from now.