I don't know what you mean by that, immigration has mostly led us left since the 1840s and the immigration of the last 40 years is so large and overwhelmingly and never ending that it ends any chance of cycles.
The under 30s spell the end of America, not it's hope.
The 60 and under crowd will most certainly will not be the saving generations, but they can plant the seeds.
The reversal has to start with us. I am 30. If my generation and current conservatives and patriots do not start making inroads in the education system and gaining more influence in the media, then it will never turn around we will setence future generations “to a thousand years of darkness.”