Funny, the committers were at an Amsterdam meetup last night and we were talking about ClickHouse Keeper. I don't think that's very high up the list of priorities for them right now. The focus is more on ensuring it is bombproof--we're in the "long tail" part of the deployment where you stamp out obscure edge cases in increasingly large deployments.

(I'm not a committer but have a lively interest in the topic as my company supports a couple hundred customers running on ClickHouse.)