The thing is, it’s pretty much Activision Blizzard’s fault here. They destroyed the grassroots competitive scene to make way for the Overwatch League, but that took a bit more than a year. They could’ve found a way to integrate the existing scene instead. And that was just the start of the League. The game itself was mismanaged with the sequel taking way too long and being misunderstood (with good reason).
There were some many mistakes with the Overwatch League, that I don’t think we can use it to generalize that much. ESports was a bubble though, no doubt.