NeverarGreat said:
http://latino-review.com/2013/10/exclusive-working-titles-star-wars-episode-vii/
The short:
Rise of the Jedi and Return of the Sith were titles given by Lucas to Disney for consideration.
So IF Latino Review's story is truthful (big IF), then this is potentially very spoilerish of the ideas that George has "downloaded" to JJ Abrams, and does not give me much faith in where this series is headed. If Lucas really has so little inkling of the possibilities of this franchise that he can only think that bringing back the Sith after they were finally destroyed is a good idea, then JJ might as well give up right now. Either that or ignore Lucas's suggestions and do his own thing.
I wouldn't mind having Sith again. First, because I really don't fall for the "chosen one" crap from the prequels. One can't permanently destroy the Sith. There can always be some force user who can proclaim himself a Sith.
Secondly, because 30 years after battle of Endor seems like an extremely boring period. If the story was set in period immediately after battle of Endor (imo by far the most interesting era) then the possibilities for villains would be great (imperial remnant officers, criminals trying to benefit from gradual collapse of Empire etc.). But unfortunately it is not.