How did these industries ever survive before the invasion of illegal immigrants from Mexico? Boo Hoo. How terrible that they will have to employ American citizens and legal residents at substantially higher wages. Will there be temporary shortages of labor? You bet there will be but that is the road that these enterprises went down when they chose, against the laws of this country, it hire illegal aliens. I have NO sympathy for them at all.
And perhaps you should be thinking a few steps ahead on the Trojan Horse of illegal immigration. At some point these illegals will become quasi-citizens (many already are) and their children will be citizens. What sort of wages do you think this illegal bunch from Mexico will be demanding for their labor then? Is your solution then to keep importing tens of millions of Mexicans to keep the train of illegal labor going? Or do we start importing illegal labor from China? Where does our immigration free for all end?
That's far preferable than causing an immediate economic depression which is what is being advocated on this thread.