The power of cinema and film is strong. If there was a movie/documentary about pool gaining entry to the Olympics it has great elements.
Early US history, international conflicts, geopolitical tension and internal oppression of players. There is enough to form a movement, legal issues impacting players and interference of governing organizations.
A precursor to pool becoming an Olympic sport is a global consciousness that pool has been impacting global lives and continues to impact small businesses through global means.
The US doesnt have to dominate, just ensure pool in America is worth going to for training. The US leads in employment of pro athletes, pool is no different.
Commercializing pool would help make it popular. Skateboarding had several films, video games and events to grow. Pool is growing. Same with break dancing.