Some loose ideas of what constitutes "space opera", I guess it's become more generalized to any sci-fi in space now.
What other definition did you have in mind? Space-based shows are similar enough to each other to constitute a coherent, identifiable group.
DS9 and
B5 didn't always have spaceship-based stories,
Farscape and
Firefly weren't about militaries in space, nu
BSG didn't have aliens, but it's easy to see the commonalities among them and with the rest of the group.
Lexx actually was on Showtime, as was Outer Limits, Odyssey 5, Stargate, Total Recall 2070, Jeremiah and the like.
Showtime's a different animal now - they've adopted a stronger philosophy of competing directly with HBO. Ironically, they'd have the rights to a
Star Trek series via CBS, but they just don't seem interested.
Women are another crucial factor. Men, particularly the key demographic are leaving TV behind in droves.
You're right - it's economic + demographic, that's the whole problem. Nothing to do with grittiness at all.
To get women interested in a sci fi, cast the leads as two hot brothers who look like the guys on
The Vampire Diaries and
Supernatural, and make sure there's a lot of slashy subtext. I'm only half joking...
Or going back to Starz, they're obviously doing something "right" with
Spartacus, which has an enthusiastic female following. (Going off the comments I've read - I can't find any actual demographic breakdown.) Gladiators in Space, hmm. Has potential.
Women also tend to prefer fantasy over sci fi, so the more fantasy/magical/vampire elements you can bring into the show, the better.
So we have a space opera about magic-wielding space gladiators who wear next to nothing and look like CW actors. Well, I never said this wouldn't require some attitude adjustments.
Honor Harrington wouldn't appeal to females - too military. That's the sort of thing to avoid. A female lead isn't particularly necessary to bringing in a female audience.