If people wanted a white homeland, then they would have ten children and close-knit communities and there would be no market for cheap immigrant labor.
But people don't want this - they want instant self-gratification.
If white Americans, as you say, retained strong moral values, then Wallace T.'s white homeland would be an unintended byproduct of a moral society.
If white people disappear, they have no one to blame but themselves for squandering their birthright (Greco-Roman/Judeo-Christian culture) for a mess of pottage (endless social programs and entitlements).
Teddy Roosevelt said the same thing to the WASPs of his day. They were rapidly passing from a substantial majority of the US population, to a minority group. Even as far back as 1900, the educated elite white population was failing to reproduce itself. Here's what Roosevelt told them:
[after enumerating the facts that showed the original settlers of the US were being overrun] Do you think I pity you? Far from it. Any race that doesn't have enough self-respect to reproduce itself should cease to encumber the ground and should give way to others who do.If Teddy were alive today, he might give the same speech to all the people of the United States and Europe vis-a-vis the emerging populations in South/Central America and the Middle East. If we cannot be bothered to reproduce ourselves, we should cease to encumber the ground, and prepare to give way to the Hispanics and the Muslims.