I think it has to be hard for a deaf person to come out of the WTS especially if they have family who are still in. I don't know if it is the same but the Montreal and Ottawa groups met at the same district conventions. And we sometimes went to Toronto - way back when the WTS was still using large stadiums. So the 3 groups all knew each other.
I suspect the same could be said of any deaf group where there were cities near enough to travel to for conventions. You all knew each other or at least knew of each other. Leaving would be more difficult to fade away
When I was first learning I would go to my friend's house and sign all day long with her. By the time I went home I was signing in my sleep. -- Really! I still love it