A lot of stats thrown around at the beginning of this 'cast, with some vagueness over which is bigger, sports or video games (see below). Either way, it's pretty apparent the gaming industry will win that competition, if it hasn't already.

https://www.gamesindustry.biz/articles/2017-11-28-global-gaming-revenue-on-par-with-sports-following-2017-estimates

https://seekingalpha.com/article/4184342-video-games-taking-will-esports-become-larger-sports

https://www.wepc.com/news/video-game-statistics/