I've come to refuse to read anything post-ROTJ in the EU. I tried to explain to a guy what the movies meant; that they're the tale of Anakin Skywalker saving the galaxy and destroying the Sith.
Reply: He didn't even really kill Palpatine and teh galaxy is as dangerous as ever.
Me: Well...um...
A moment of realization. The new Sith are shit and should be ignored.
Everyone who's ever played/watched/read the star wars saga or EU will know that the Sith were a huge power in past history.
Everyone who's ever played/watched/read the star wars saga or EU will know that the Jedi overthrew the Sith at a point and thought then extinct.
Everyone who's ever played/watched/read the star wars saga or EU will know that the Sith rose again (not in as many numbers) to destroy the Jedi again...
It's a never ending loop thats happened before and it's not unreasonable to believe it will happen again. Tbh, i think the Skywalker prophecy is irrelevant mostly, unless it applies to the entire Skywalker legacy - seeing as most if not all Skywalkers have become successful Jedi and fought to defeat the Sith (unless they become one)