Can someone remind me what will happen to all the chromium derivatives that support ad block? Will Google restrict their functionality? If Firefox and Safari are the last browsers to support ad block, then they totally stand a chance.
At least Brave and Vivaldi both use the Chrome Web Store, which presumably will no longer allow such extensions. So either they'll have to build their own alternative, or change the browser to allow out-of-store installation, and the extension author(s) will have to support that.
The changes which impede ad blocking are in Chromium, not in the commercial Chrome fork. And Google will continue to force anti-ad-blocking, pro-tracking changes into Chromium until they reach their ultimate Shrodinger's Privacy-Friendly Browser which exists in a superposition of "showing few ads" and "allowing all tracking."
Chrome didn't remove ad-block entirely, they deprecated an API that allows direct control; extensions now have to load filters into the browser itself, which will do the blocking.
Safari actually did the same recently[1], so it's not an alternative if you dislike this move by Chrome. The only difference seems to be the limit of rules (30k for Chrome vs 50k for Safari, whereas some lists used by uBO have over 75k).