Entertainment experts in the US believe Coupling would have remained in its prime-time spot if network executives thought ratings would improve.

BBC: The US version has prompted scathing reviews

What would television look like if viewers, not network executives, decided which shows get produced?

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But if HBO executives are concerned about the crowded marketplace, they aren't letting on, arguing that their network operates on a different model.

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Even if Fox executives decided to make an offer, O'Brien may well be barred from appearing on another network for a year or more, depending on the contractual arrangement hashed out with NBC.

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