The question is what people in general (the normies) are willing to do to rectify the problem

As always, they'll do what the popular 10% who capture the zeitgeist tell them they should do.

These politically correct, sniveling cowards will be on the side of whoever captures the culture. They'll be as far right or far left as culture permits and encourages; as racist and nationalist, or as open borders, as society tells them to be.

It's happened before, and it will happen again.

My argument is that the amount of force required to remove the shitskins, the feminists and the political left (as it currently is, at least) is so great that we've passed the point of no return.

I fear you're right about the force required, and it's not something I relish, but I do think it's possible that it happens. And the normies will be some of the biggest cheerleaders. Or at least keep their mouths shut and go along.

Whatever will become of our nations, we will have to accept the above sordid elements as being fundamental parts of them.

Likely some elements, but I don't think all are baked in yet, and there is still time for reversal.