I haven't seen anything yet on whether Brave will support it, though if I'm understanding correctly, they won't have a choice since they're using Chromium. Hopefully I'm misinformed.
Ultimately I think we must permanently return to browser ballots back by the law, like the IE bundling fallout. Otherwise friction and incentives will continue to entrench one dominant player.
They get hate only for bad or useless things (like the famous "independent voices") but a lot of love for the actual work being done, especially Firefox Containers, enormous performance improvements etc. I'm using Firefox on a daily basis and just the Containers feature make it so much superior to Chrome.