I'm not worried about this at all. I don't use Chrome anyways. I use Brave. It has a built-in ad blocker that works pretty well and I don't see that going away.
Here's the concern with Brave since it's Chromium based:
For as long as we’re able (and assuming the cooperation of the extension authors), Brave will continue to support some privacy-relevant MV2 extensions—specifically AdGuard, NoScript, uBlock Origin, and uMatrix
I don't really use Brave as I don't want to support the Chromium/Blink/V8 monopoly, but aren't it's built-in "Shields" functionally equivalent to uBO but not reliant on the extension APIs?