Boomers don't need to be replaced.
There is no skill shortage, nor was there ever one.
you don't understand economics.
Economics 101: As the supply of something increases, its value decreases. For example, increasing the labour supply decreases wages. With less people in a given country, there would be less division of labour and economies of scale.
Also, immigration of workers that are below average productivity will reduce the average productivity of the economy, which matters when considering all redistribution policies. Thus, it doesn't matter if immigrants clean toilets or work as bankers. They cost more than they contribute.
Despite being statistically insignificant, the few somewhat profitable non-Westerners, no matter how many generations they’ve been in the West for, can't pay back into the system because all the wealth, capital, resources, and territory siphoned off to those aliens could have gone to Westerners and the children they could have had if not for those aliens displacing them in the first place, not to mention all the Westerners that have been left behind or pushed into poverty just so any one of these aliens can be accommodated and artificially uplifted.
Immigration ruins economies. Racial homogeneity grows economies. If you need immigrants to win anything, least of all non-White immigrants, then you've already lost.
They are citizens now, you would need to make it legal for the government to revoke citizenship and deport people which isn't a power I want the government to have as it could be used on anyone.
Everything to do with COVID was illegal and the government did it anyway. And the current immigration policy is illegal, especially since it wasn't even put to a pubic vote, the law itself was illegally changed decades ago.