Overwatch will probably be dead in ten years as a "sport". It's even more jarring with games that come out every year. There's really no reason for players to get professionally good at Battlefield 3 (Madden 14) if Battlefield 4 (Madden 17) is the same game but not. It's also less interesting as a fan.
I guess what drove that statement was the StarCraft -> StarCraft 2 transition, both of which are shadows of their former selves because the business model of a game publisher is not that of a sports league. They have conflicting needs.
I felt like Grandpa Simpson: "I used to be with it but then they changed what it was."
Frequent tweaking might be great for active players but I think it will be a pretty big block to ever allowing esports to compete as a casual viewing event alongside regular sports.
[0] https://www.reddit.com/r/smashbros/comments/1qixpa/the_year_...