You're a bit all over the map on this thread. That's OK, but I am not sure what your bottom line is.
Here is how I see it. The die is cast. America is going to become less white. Indeed, without robust immigration, America's "virtu" (I am using the term in the Greek manner) over time I suspect would degrade. Immigration, and the makeover of America, time and again, ever stronger and more robust, is part of the American story. In any event, even if one has angst this time, because this time it is different, there is no stopping the train. The trick is to make the train end up at a favorable station.
As for American Jews, and intermarriage, the stats I have read is that the rate of assimilation is catastrophic for those wishing to preserve a Jewish qua Jewish identity and demographic. About a third of Jews in each generation lose their Jewish identity via their kids and grandkids. The absolute number of Americans who identify themselves as Jewish in America is slowly declining, despite some Jewish immigration from abroad.
I'm not all over the map. I don't mince words about how I feel about this issue at all. I think I exhibit more candor than most anyone here. I hate phony facades.
I don't share your optimism about multi-culturalism here.
If Americans recovered the birthrate they once had your argument for immigration repopulation would be moot.
There is absolutely nothing wrong in my view for the predominate founding culture of a nation to seek to preserve it's predominance....not to me anyway.
Especially when I view the track record of these immigration pools which you have such high hopes for.
I do agree with one thing, baring a cataclysm...the die is cast. Not just for when "whites" become only a plurality but rather a minority or are bred out completely ...the latter being what many on the far left and more than a few here on this forum desire....because they resent "white" history of cultural and political dominance here even though that checkered history is arguably both history's most powerful and altruistic.
I obviously do not share that desire..in fact quite the opposite.
As id it matters....I don't want a plethora of any immigrants period to tilt the balance regardless.
It is not simply about whiteness...hardly....there are plenty of unsavory white ethnic groups worldwide I'm not too crazy about...in fact we are in a war with a big chunk of them.