There is no evidence at all that any such thing will happen. The demographic collapse in birthrate has many factors but competition from foreign imports is certainly not one of them. In fact, Mexico's birthrate is dropping even faster than the US rate.
Why do you feel the need for ad hominem attacks? It doesnt add to this discussion. As a side note though, the British people did not throw out Churchill. They threw out the Conservative party, principally because it was out of touch with the electorate. Churchill himself remained very popular.
Churchill is a hero and I lost all respect for the British people when I learned in grade school how shamelessly you cast that brave man aside once the Nazi threat was done. I spit on your stupid insignificant island of gloBULL insanity.