While I sympathize with pool getting into the Olympics, how on earth should it be there ahead of water polo? Besides being played professionally in parts of the world, it is an organized sport in many high schools as well as at the collegiate level. And while the debate about whether pool is even a sport occurs even on this, a pool forum, there is no question that by any measure water polo is a sport and a grueling one at that. It also has a well organized structure of federations world-wide that govern the sport.
I mean if you want to seriously discuss the topic of what pool should replace that's fine, but don't be silly.