What's with all the bitchy sitcom wives / idiot husbands?

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OP: What do you expect? If the public keeps watching it, why would they try something new? They can either take on a big risk which will likely, at best, have a small, niche audience, OR they can just do what is working and sure enough to get ratings.

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I tend to agree... whatever brings in the best/biggest audience with relatively little risk will keep getting made.