While I agree it'd be better if we lived in a world there were 5 separate major browser engines all neck and neck using 5 separate huge sources of funding I also agree the Chromium based browser monoculture doesn't feel or function like the IE monopoly did. If anything I've almost wondered if e.g. Mozilla's resources would be better spent being another Chromium based build that insures development of functionality Google refuses to maintain (like proper blocking APIs) instead of trying to compete 1:1 on every line of code.
Chrome is still faster on some sites, so I still have it installed and pull it out when I have a specific need. For example: Watching long videos in unfocused windows.
Also, Firefox syncs tabs and logins really nicely. Much better experience than I had with Chrome, that one was very unreliable.