Of course we live in the now, but sooner or later, the future will come. So since you brought up these examples, let me posit the following questions:
-If crime somehow stopped, would police accept downscaling?
-If illness suddenly stopped, would physicians be willing to retrain?
-If fascism was completely eradicated, would Antifa disband?
If the answer to any of these questions is "no," then that's problematic.
You fear a possible future where Antifa is not quelled even if fascism is erased. I fear this current future if more people don't react to an outrage like it's actually an outrage.
I've said elsewhere in the thread that I don't really fear Antifa that much, that while I find their methods and philosophy iffy, they lack the means to actually enact communism or anarchism (neither of which are inherently bad, but their implementation usually goes wrong). Also, if by outrage you mean George Floyd, I think plenty of people are outraged by it, not just in the US. I don't think there's any basis for arguing for a lack of outrage. If that outrage doesn't result in change, sure, but the reaction is pretty universal. But if we're talking about fascism, or racism, even if both of these things were eliminated today, there's plenty lurking in the future that gives me fear. Racism's a bigger problem than Antifa, but to borrow a quote, if one employs the argument of 'bigger problems to worry about,' then we should all be focusing on surviving the heat death of the universe.
What are the suffragettes up to nowadays?
They became second wave feminists, then third wave, then fourth wave, and along the line turned to infighting.
Feminism is another case of slaying smaller dragons. I'll grant feminism that those smaller dragons still exist, but even if they didn't, I doubt there'd be consensus as to when the dragons had been wiped out, since feminism's 'mandate' has been broadly expanded, for better or worse.