“What’s less discussed is the polarization of culture, and the new echo chambers within which we hear about and experience today’s cultural hits. There will never again be a show like “One Day at a Time” or “All in the Family” — shows that derived their power not solely from their content, which might not hold up to today’s more high-minded affairs, but also from their ubiquity. There’s just about nothing as popular today as old sitcoms were; the only bits of shared culture that come close are periodic sporting events, viral videos, memes and occasional paroxysms of political outrage.”