We must also consider the fact that zips could come more numerous to swell the ranks.
I post this whenever this topic comes up, which seems to be about once a week. But where are these "zips" coming from? Are you remotely familiar with American immigration laws today?
Italians are at the bottom of the list today when it comes to being granted green cards. They're not Mexicans, and they can't crawl under the fence to get here. And even if they could, who says they want to?