I'm sure there were many attempts to move into Okinawa, however I would blame communication problems as the reason for it not happening. People in Okinawa don't speak Japanese. They speak some strange Kansai language that no one else can understand. If people in Kinki spoke Japanese, there would be more wrestling there.
Here I am, trying to make things pleasantly annoying and generally irritating, and you have to go and clear things up. Thanks a lot. The gag I was going for was a little obscure anyway, so I suppose I can let it slide. Edit: This time.
On a serious note, I don't know how you can call Okinawajin and Japanese the same language. They are no more the same language than English and Kentucky-speak are the same language. This is not even one of my own crazy ideas. Azuma Kiyohiko-sensei first introduced me to the idea, and will back me up on this one.
That aside, didn't Toryumon used to run Okinawa? If so, Dragon's Gate probably still does.