We already tried the colorblind meritocracy. And it wasn't in the USA, it was all across the west, Europe, Canada, South America, and the result is exactly the same everywhere. I think this is what is most amazing, to look at crime rates in London v. NYC v. Stockholm v. Toronto v Berlin and see the exact same numbers everywhere. Quite remarkable.
There is no range at all, you are either okay with Whites existing or you have a colorblind meritocracy, which means Whites will go extinct. And telling Whites to "just have kids" isn't a realistic fix, it just an excuse to not think about this serious issue in more depth, because at the end of the day Whites will not just have more kids, it isn't in their genetics to just spit out kids. And if someone says to this "okay, then Whites will just go extinct if they refuse to spit out kids" I would say "yes, that was my point, I agree".