Kasparov puts it down quite well in his tweet (https://twitter.com/Kasparov63/statuses/416269627677630464)
Not only is esports separated into too many games for a genre, the games being played are outdates very fast, so there can never really grow a sport with a big tradition. Ever heard of change to the chessboard or a new piece being introduced, ever heard someone changing the tennis field into a round circuit, to make things different?
What would you do when a new version of QL comes out QL 2.0 with rage engine, new levels, but even more dumbed down gameplay comes out with no bunny hopping (looks gay according to j. carmack) and strafejumping being romoved (no realism according to j. carmack). With only these minor movement changes, but not many other changes, same weapons etc., so it still remains very similar to QL 1.0, so people will make the same switch from q3a to q4 to ql to ql 2.0, without bothering too much .... QL 1.0 would be dead within 18 months, and everyone would play QL 2.0 from now on, you know it and I know it. And how much would the QL experience have been improved? Remember, it happenend once, QW had Aircontrol, Q2 had double jumping, Q3A had nothing, Q3A had even dumbed down levels like tourney2 and tourney4, that were the main duel levels to be played ... it happenend once and it will happen again! Only solution is an open source fps game that really catches the attention of most gamers, as long as companies are behind the games, pulling out the successor version 2.0 of their game, the old game will always be outdated, and there will never be any tradition or culture that a community can be based on