Of course this replaces traditional TV. The time I spend watching TableTop I might have spend watching a traditional game show a decade ago. I talk with other p

Of course this replaces traditional TV. The time I spend watching TableTop I might have spend watching a traditional game show a decade ago. I talk with other people about what happened in the latest episodes. Those shows don't fill a vacuum - they replace something else. And that something is a certain part of traditional TV. You are right that content produced for Youtube does not in general replace scripted drama/comedy. But that is only a tiny part of traditional TV.