Here we go again ...
There is not 1 problem why Pool is not popular, there are several. People attack these problems in an isolated way, which does not have lasting effects.
First, for Pool, to make from being a game into the 'Sport' category, it has to be organized and have structure, with graduating levels into the highest level of being a Professional, that makes a living in the sport.
Hardcore Pool people are similiar to Archery Fanatics in many respoects, except Pool is a little more mainstream since it is done more for entertainment than archery is.
Pool has to be available to kids, pure and simple. Junior leagues, junior tournaments, with Pool being offered as a sport in Junior High through High School. School teams competing, collegiate teams competing, being in the Olympics. These things will help change the opinions of many people concerning Pool, and the standards for Play will rise, as will the conduct of the players, and the intensity of the competition.
Also, I think that the 'Semi-Pro' level needs to be much more definitive, with events for them while not allowing Pros to bottom feed on these events, but to allow a lower level to compete a level above. You don't see a Royals player popping in to play with the Wranglers here in a tournament, do you?
There is 'Hustling' that goes on in every single sport, and sometimes it is brought out into the open, but I do not believe it should be the main focus of the sport, and Pool is more that way, in peoples minds, than being regarded a true sport. Leave it in the backroom, or dark corners, provide some interesting stories about it, but don't make it the main focus, because that would be self-defeating of your main goal to lift Pool up.
International competition helps raise the level of interest and competition.
Look at the transformation that Soccer has undergone in the USA. I played playground unorganized Soccer as a kid. My kids played organized school Soccer and AYSO Soccer going to training camps put on by the Wichita Wing players. I coached AYSO Soccer. My ex-wife and I were avid Wings fans for 7 years, never missing games. I played organized Indoor Soccer for many years myself. (hence, my propensity to wear Long sleeved T's with shorts a lot when I play Pool, a leftover from Soccer days).
Poker is popular right now because there are no real defining physical skills required for it. The ones that really have no chance in a game are slow to realize that fact (carrot on a string), and they always can get lucky, right? or get the cards, right? It would be like my chances against Efren? I could get lucky? right. He might make a mistake, right? He might not run the last 5 balls, right? I have started seeing the enthusiasm for Poker start to disipate locally, and soon this will move upward.
Then you have the whole matter of individual nion-related tours out there with each promoter working for their own interests. That is too lengthy a discussion, but it all goes back to the lack of a good infrastructure for Pool, just at the intermediate levels. It is also reflected by different Pool organizations not working together in a cooperative way to provide structure within the sport.
I asked in another thread, why is their no Pool clothing produced that has caricatures or likenesses of the Pros on them along with organization name on it, even the IPT? Or Classic Old Pros like Mosconi, Crane, Lassiter, Greenleaf. I mean, you could do just a sample run on something like this just to see the demand for it.
And, there has to be a viable governing body over the sport that communicates with lower levels, provides guidance, offers goals.
And, yes it is true, you have to be able to market the sport in the right way to attract attention, but it is much easier to attract people to it if they grew up with it in some way. (Baseball, Football, McDonalds, Pizza Hut).
Then maybe, people will stop thinking it is something to do other than minature golf, or cheaper than golf. (which is funny, because when I was a kid, you could play Golf all day long for $5).