ATMachine said:

"Victory? Victory, you say? Master Obi-Wan, not victory!"

I think there has to be something left for Luke et al. to fight.... otherwise we wouldn't have the ST.

Yes, but is there any reason that it has to be close relatives? It's just history repeating itself ad infinitum. Not only does in perpetuate the annoying 'small universe' syndrome but it defeats the poetry of Luke's victory over the Darkside. You need a few deaths every now and then in these kinds of things to add to the drama but to have massive allegiance shifts, due to the dark side, occurring in every (effectively) generation is tedious to the extreme. It's just an unforgivable lack of respect and imagination. Balance to the force, but if you blink you'll miss it.