No jobs means no rent payments.
No rent payments means no roof.
No roof means "goin' back home", just like many of the Invaders in Arizona are doing.
You have noticed the invaders are leaving Arizona like rats fleeing a cooling camel corpse, haven't you? The rest of us have. Funny effect that, for a law that hasn't even been enforced yet. Just wait until the Robert's court properly declares the provisions of the law Constitutional and other states rush to copy it. That will put huge pressures on the remaining states to follow suit, too.
Again, the solution is that simple. It's called "enforce existing law". Which all that SB1070 allows Arizona police to do, and nothing more than that.