There was an interesting thread about e-sports in the Olympics eight months ago: https://news.ycombinator.com/item?id=23726597
IMO Olympic sports should have rules that everyone is allowed to use, study, modify, and share variants of, in other words they should give players the Free Software movement’s Four Freedoms¹. This way the rules are accessible and adaptable. Good candidates might be Quake or a freed NES Tetris or Super Smash Bros. Melee. The latter two have benefited from being reverse-engineered enough to be modified by their communities for better training and competitive play.