My idea of Clubs was downvoted but it was still added c;Honestly this was already discussed and since it'll cause lots of problems it's been down voted.
But it won't be a full-on survival mode. You can only build on plots you're added to, so it wouldn't be completely ruining the idea of creative.It would not be a bad idea, but the reason it is called creative is because you are in creative and you build stuff!
I feel like by adding survival mode, it could possibly ruin aspects of creative.