We have tangled before. I have long suspected you of being a leftist plant. I have backed off that suspicion, but still view you very much as a RINO.
But that is not the topic of this post to you. Having said what I said, I still agree with your quoted text.
Let us assume we can do little or nothing as to changing the ethnicity or national heritage of those who are born or migrate here. Those are very 'fixed' and unwavering.
What we CAN change, is their politics. For example, I have viewed Latinos as a very ripe group for conversion to Conservative. They are family-oriented, hard working, sacrificing and Christian people. Very doable, to get those sort of people to see things our way.
It would require a major effort, and lots of instruction about what this country is and how we got rich. We would need a lot of spanish-speaking freepers to step up.
Thoughts?
I've done it. It took me more than a decade, but I turned my in-laws from reliable Democrat voters into conservatives.
All you have to do is stick to your guns, and eventually they'll open their eyes.