The review of this proposal is now over. The core team has decided to accept the proposal with the revision that the method be named removeAll(where:).
In this thread, we also discussed whether to add a removeAll(_: Element) method. While I think that's a reasonable-sounding idea, I do think it can considered independently of SE-0197, since it wasn't originally part of the pitch. If you're interested in adding that method, I encourage you to start a new pitch thread for it.