message to community about community decline

Oh, you are retaining editors, just not the right kind. It is a natural selection after all, just based on wikibrawling skills. To quote en.wp arbitrator "Who could have known that someone could get away with such behavior on Wikipedia with only a single 24 hr edit-warring block." (google this sentence for context)

I agree with the view that Wikipedia (and its sister projects) is preferentially retaining the wrong kind of surviving editor. See this Summary Diagnosis for the details.