You can put lipstick on a pig and call it a show girl, but it is still a pig. You can call these e-sports all you want. They aren't sports.
I mean if 90%+ think arenas ruin a game and <10% vocal minority demand them, who do you think will lose that argument? Trying to make WoW an 'e-sport' seriously damaged blizzes money making model. Why would another company want to to risk that for a small minority?