Well, it hasn't happened yet. Judging by many comments here, a lot of HNers still use Chrome. If people here still use Chrome, I see little hope of regular users ditching it for these sorts of reasons.
However, the day that MV2 is removed in Brave I will switch to Firefox.
Not sure why anyone would use Chrome over Brave though.
The writing is on the wall, why are you so keen to wait til the last minute?
They'll eventually leave and wonder why nobody told them sooner.
I no more fear Google banning ad-blockers than I fear Toyota putting spikes on all of their steering wheels. It would be much more painful to their bottom-line than any Toyota drivers, because people would do this magical thing called... not using that product.