with the way this is going to be implimented it will cause a HUGE downfall for minecraft which not only will push away players and creators thus causing less content to be made but also harm the sales of future projects and existing projects. Yes there may be a problem with the fowl language and harmful behaviour that happens on servers but that is better done (by the looks of things) by the server admins as they will be able to see the full context, and even be able to share the names of problematic people with other server admins, not only this but banning them from singleplayer worlds? are you out of your mind?