A self-updating feature in redis-cli? Sure, why not. All the cool kids are doing it .. (=>in: 2007) ;)
I also think it's a weird non-feature. That's certainly the one item of the survey that made me tick.
Another simpler thing can just be redis-cli --latest to output the latest version of the Redis server.
In a typical production scenario, you deploy a specific version of Redis and you don't care if it's outdated or not. That's the tested and production-ready version at Company X.