The gay couple aspect would not play well in many places either though I doubt that would be a big factor in large urban areas where most of the US population lives. I find that the whole family/significant other/son/daughter/adoption subplots written into many shows these days detracts from most, if not all, of them. If I want to watch that type of programming then I'll watch a family oriented drama. Writing such subplots into other types of shows is becoming more of a crutch for lazy writers and producers with limited budgets. It is symptomatic of a general decline in the quality of programming on network TV. The big production money and higher priced talent is being siphoned off to premium specialty channels and streaming services.