I don't understand the tack most of y'all seem to be heading along. Consider the relationship between the NFL and NCAA football. One is the professional system (although there are smaller pro leagues around the country), the other is the amateur system. They use different sets of rules to play the same game, mainly because of that divide between the amateur and pro environments.
If there were a single governing body of professional pool, why should the other leagues use the same rules? APA claims to be an amateur league, as do most of the others. I like golf's definition of "amateur". If you make more than half your income playing golf, you're a pro. Everybody else is an amateur. Why not establish the same mindset so we can actually have that pro/am separation, and stop harping on the leagues for not being more professional? Sure, amateur and professional golfers use the same rules, because they're playing the same game.
Pool players aren't all playing the same game. We're not even using the same equipment. 10 Ball, 9 Ball, 8 Ball, 1 Pocket, 14:1, table lengths from 7' to 10', 12' for snooker, are you kidding me? Part of the way golf gets away with having the same set of rules for pros and amateurs is 1) the quality of your playing partner doesn't have a direct impact on your score, and 2) a par 72 at your local military base isn't nearly as hard as the par 72 at Augusta National. 3), if you like, is that if I'm having a bad round of golf, I can pick up my ball and move on to the next tee without screwing the whole day. it's 1/18th of my round. If i give up for a rack in a race to 5, 7, or 9, I could be giving away the match.
By all means, let's have one major organization for professional pool in the US. I see no problem with having myriad leagues and organizations for amateur pool, because having multiple options on how to play the game is how you get people playing. We don't need one set of rules: we need one mindset to bring us together as a community.