> If uBlock Origin doesn't update, there'll be a dozen adblockers that work with Manifest v3 on day 1.

You seem to not know what manifest v3 is actually doing.

Any adblocker with a static list of domains per-update of the crx file's manifest is useless. Users would have to install hundreds of extensions (each with dozens of domains that they themselves block), just to have the same functionality.

If any anti adblocking team of any ad network decides to just rename foo.tracker.net to bar.tracker.net, all adblocker extension users would have to REINSTALL the chrome extension manually because the manifest's list of domain is statically builtin.