Sorry, citizen, I think you meant to say RIGHT show!!
As others have said, a British shorter season won't necessarily work for a US show. Advertising revenue on the commercial channels, isn't a really big issue, hence they're able to do shorter seasons such as crime dramas.
Then on the other end of the spectrum, you have the soaps that have 3 episodes a week, week-in-week-out, for eons!! Well, decades, it just seems like eons!!