> Or will they have to concede like opera and edge did.
I am sad to say this, but I think it's only a matter of time. At this point, the list of parties driving Web standards basically consists of a whole bunch of organizations that rely on Blink, plus Apple and Mozilla.
WebKit can probably hang on for a good long while because ~15% of user-agents are required by fiat to be WebKit.
Gecko? At 5% marketshare, I fear it's dropped below the point where web developers are well-incentivized worry too much about making sure their sites run well on it. Which means that it's going to get increasingly costly for individuals to continue using Firefox.
And, at the same time, actually making sure your site runs well on it is getting increasingly difficult. The rise of client-side JavaScript frameworks like React means that cross-browser issues have moved beyond easy-to-perceive things like ActiveX controls not being supported, or CSS rendering badly. Now the big problem is differences between JavaScript engines leading to annoying performance problems. And, if a developer is planning on doing the sane thing and relying mostly on libraries for their heavy lifting, there's just not that much that any individual can do about it.
My sense, at this point, is that, going forward, the Internet does still have room for free, open, community-driven standards that aren't tightly controlled by a small number of massive corporations. However, the Web (i.e., HTML, CSS and JavaScript) does not.