If the Clone Wars series is any indication, then there's a good chance that the live-action series will successfully be about characters -- good characters -- and strong thematic stories.But if it flops, it could have a terrible chilling effect - even Star Wars can't make it on TV! What hope does anything else have?And my point that if the SW series is a huge hit that it might lead some other space opera shows to get a greenlight still stands.
And yes, it can flop on TV. The prequels were a great example of stories that play into the visual/visceral strength of movies. The fact that it had some terrible characters and stupid, inert plotting didn't matter because they were movies. But on TV, it would matter. Maybe we'll luck out and Lucas won't try to write anything. Or cast any of the characters.
The Star Wars brand on a high-profile network will get people to tune into the premiere. And that's all it will get. If it sucks, people will leave. Star Wars is not some kind of sacred totem.
I think the collaborative nature of producing television shows forces Lucas to concede much of his control to others, allowing for a better overall product that the Prequels -- which were driven, almost entirely, by Lucas.
Then again, the Young Indy Chronicles were hardly a resounding success, so ...