I know a lot of people want them, but to me that is a completely useless feature I I dearly hope that it never makes it in this game.
Because other players being able to toggle speech bubbles on impacts your gameplay in a negative way?
No, that can't be it... I guess that you just think that you should have the final say-so on how other people play the game.
On a more helpful note, create a new chat window dedicated to local chat.
All the talk in general won't push stuff off the screen nearly as fast, so if you are somewhere trying to RP, it will be a lot easier.