Lets get it back on track.
This is just an excuse for nerds to tell people they do sports when people ask them though isn't it. The dictionary literally defines a sport as 'a game, competition, or activity needing physical effort and skill that is played or done according to rules, for enjoyment and/or as a job:'. I don't personally believe that clicking a mouse and keyboard counts as physical effort. Just call it what it is, video games. Its a competition, a challenge, a league, but it sure as hell ain't a damned sport.
I don't think anyone really thinks esports require the same amount (or even close to) of physical effort compared to real sports. As tobi said, esports =/ sports. As for the general/overall effort and skills required (from chess-like thinking skills to motorics/precision skills), it's pretty much on the same level though. And the same goes for rewards and viewers. It's not quite there yet, I think, but it's getting very close, and it's rising with an alarming rate, which is what the article shows.
I think more and more people are recognizing this, that's why you see big names such as Mark Cuban (billionaire, owner of NBA team Dallas Mavericks) try to cash in on the esport train with betting:
http://www.inc.com/graham-winfrey/mark-cuban-unikrn.html?cid=sf01001This years International (Dota2) prize pool is going over 15 million dollars, that is some serious money. As soon as you have such amounts of money, you will see all kinds of people trying to cash in on it. Teams, trainers, managers, player training schedules, team houses, sponsors, it's all here already, very similar to real sports.
I honestly wouldn't be surprised if esports goes over sports once the 'gaming' generation gets older. Heck, looking at the charts I think it might happen sooner than we realize.