I don't believe that the average person is interested in racist ideology. The people it tends to attract are disaffected white males. They tend to have poor education and poor job prospects i.e. no hope for the future. My guess is that they were already radicalized before being heavily exposed to racist ideology online. They will still be able to cluster online. It just won't be under our watchful eyes anymore. It'll be similar to how pedophiles cluster online.

I hope that you're right and that I'm completely wrong about this.