"By then the U.S. will be another Third World socialist tyranny, or even a failed state whose polyglot population engages in tribal genocide." Or Americans can work now to put an end to the polyglot population and make the United States ethnically homogeneous. That way, even if the state fails, the nation can still survive.
It's probably too late for that. The Hispanic population is enormous and growing rapidly. Their culture has no tradition whatsoever of limited, stable, ethical government. Nor does that of the millions of 3rd-Worlders (including Muslims) flooding into the country. The ethnic and cultural divisions in this country between blacks, whites, Hispanics, and Asians are far more profound than those which have caused centuries of civil war and even genocide between Serbs and Croats, Flemish and Walloons, Jews and other Europeans, and different black African tribes.
Tancredo was the only candidate I know of who actually had the guts to attack our out-of-control, suicidally-foolish legal immigration policy, as well as illegal immigration.