I would speculate that a critical mass of the population has to internalize a middle class outlook first. International aid experience has demonstrated many times that just building railroads doesn't get you there. You need people ready to sue them.
For a long time networks just wanted to buy imitations of other shows - i. e. Curb (the Enthusiasm or the Office). The word gets out that "Hey, we want to buy something like that" and every comedy producer just starts dreaming up ideas like that.