Hahaha seems you don't follow football a lot. A team can always decide to sell off their players, so then if team A puts a player on sale, Team B can decide to buy that player if interested.
And for the Viewers, they won't necessary have to invest to watch a MATCH, it could all be live streamed So fans can just log on and watch their favorite team play, also, it could be pre-recorded for people who weren't avaliable to watch live.
This is just how I Fantasize the game to be, if WE as a community can build it, it would be SUPER!