I hold out perpetual hope that ClickHouse will move to a Raft or similar based consensus model and drop the external dependence on ZooKeeper on day.
They're using NuRaft from ebay to drop zookeeper. As far as I remember, it's actually already merged and available to test. Performance is ~3x slower in terms of write as they're coordinating everything themselves, but it should be _much_ easier to maintain.
I'm looking forward to this, too, and want to see more in terms of docs / support here :)