Much of the analysis that followed focused on the show’s politics: Star Roseanne Barr is an eager champion of debunked right-wing conspiracies, and the premiere’s storyline hinged on her character’s support for President Donald Trump. And since the 2016 presidential election, television programmers have been working to find ways to reach working-class whites who voted for Trump. The success of “Roseanne” only reaffirmed those efforts. But looking ahead to 2018-19, “Roseanne” may be a harbinger of a less titillating, more significant programming shift — the revitalization of the broadcast comedy after years of emphasis on drama.