I see people saying that "casual fans" won't watch the games this way, and I don't think they understand how streaming TV works.
For example, if you get the Hulu Live TV package and have ESPN+, the games all show up in the same row of "Live Sports" looking just like games on other networks. There is no need to go to a separate app or even search really. I never pay any attention to what network something I want to watch is on, because it doesn't matter. It's just a picture of the game that I click on and watch it.
I assume Youtube, Sling, etc probably work roughly the same way. It might be even more convenient for "casual fans" than switching between channels.