Star Wars 7 rumors: the villains are Dooku's family

http://moviepilot.com/posts/2014/09/15/are-count-dooku-s-descendants-the-villains-in-star-wars-episode-7-2272758?lt_source=external,manual

granted, this would make sense that they would be out for revenge, but... why wait 50 years? they couldn't do anything while Vader and Palpatine were around?
.......
that does make some sense, i guess. but why not during that 30 year timespan between Jedi and VII?
.....unless the opening crawl details such events.
...............
i could see this working.