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I can't really speak to whether Showtime has been able to "nurture" shows that are not gay-themed, since I am not in the U.S. and can't watch the channel (you can't even get on the website from outside the country).
However, the Wikipedia article lists almost 50 items under original programming. So three of them have gay themes; I'm not sure why that's a problem.
Also, Weeds is a show that comes to mind that's great, on Showtime, and doesn't have gay themes. (I hope it's still being aired!)
Perhaps the success of these shows and the failure of those that don't have gay themes (if that's what not being able to nurture them means) just means that there's an audience for these shows, even if they are bad? If it bothers someone that there's an audience for shows that are racy and are about gay people.....
Also, I think it's pretty clear that more than just gay people watch The L Word. I was responding in part to the idea that only gay people would want to watch a show about gay people, which doesn't really make sense and is a little offensive to me.