There is a lot more to it then that. Team sports have numerous differences. They are seasonal and played in real time. People bet on sports and have an interest in the outcomes. They have regional followings and team loyalties. People get involved in everything from buying team merchandise to the tailgate parties. They feel like they belong to something, just listen to sports talk radio to hear the passion.Team sports are a shared experience.
I was told by a big wig with ESPN that that viewed pool as an exhibition sport. Not a sport where anyone really cared about the outcome but just liked watching the game played. He equated it to showing a rodeo. It would not matter if it was 10 years old a number of people would watch anyway.
On the other hand you don't see anyone investing in and buying the rights to old baseball games and airing them. People don't care about watching something that does not really matter. That is where pool is, in he words of Bill Murray, "It just doesn't matter, It just doesn't matter".
There is no way to change that. People don't pay attention to things that don't matter to them and few things are less significant then pool.
You mention bowling, at the time bowling was becoming popular they had a carefully thought out business plan how they were going to promote bowling and league play. I remember my grandmother joining a bowling league, this was no accident it became so popular. Then all those new bowlers would watched the game on their black and white TV's. If you remember bowlers were playing for $10,000 purses in the 50's. This was "BIG" money and very exciting. Bowling, if the match is not a blowout, is a very exciting game to watch coming down to the last ball many times, it had real drama.
Pool has nothing what so ever that compares it to these other sports for the viewer. The better it is played the more boring it is. That is just a fact and can not be changed. Pool needs to just settle into it's nitch with it's subcultural following, who are at best semi-loyal, and accept it. At best it may have a small following on the net with PPV, if you can ever get anyone to actually pay.