No and No.
There are 291 active worlds on-going in the game at the time of this post. I don't know where you would want to draw the line, but it is pretty hard to have the man-power to be in all worlds of over x people. It is not that many people will use the service of the brokers, but the fact that each broker has to log into and check the status of quite a number of worlds, which is time-consuming. Another issue is that for each broker joining a private world, one player quota would be taken up.
World owners do not automatically become a broker. There have been suggestions that world owners could appoint their own admins and brokers in their worlds. However, we have since encountered some issues with owners editing / deleting the airlines of our players for no reason at all. This is in conflict with the interest of the game, and of us admins. As a result, we are in discussion for possible restraints on the power of world owners, and any further empowerment has been put on hold.
Frankly, private worlds do not need official brokers. Due to a loophole that is more or less stated above, it is quite easy to finance airlines in private worlds, and a lot of owners are abusing their power in that sense.
