The moat for the editor is the plugin shop. We will be able to see how committed they are to being open. At least for now, their Live Share plugin doesn't seem to be available for other editors [1]. It's nice to have easy access to debugging but how do you sell your editor if you don't have all the other productivity features?
This is literally the Embrace/Extend part of EEE
Even if they remove support for the protocols, those language and debugging servers still exist. Those servers are controlled by a wide variety of organisations, all of whom are committed to supporting the entire ecosystem of editors.
It doesn’t take much to regurgitate “EEE” on an MS article. If you can’t even imagine how the final E works in a specific case, maybe say nothing at all.
Not only is it easy, VS Code made it easier than ever. By creating protocols for language and debugger support, they've liberated future text editor developers from having to support every language under the sun. By adding support for the protocol, the new text editor automatically gains support for all languages.