Greenwald et al haven't finished their run yet, and have done a good job of keeping the story in the news. A second leaker probably wouldn't change the trajectory of the story right now. They may want to stay and see if things change. If real reforms happen, there's plenty of fun stuff to work on at NSA. If some programs are continued despite those reforms, then it's time to blow the whistle.

And if only bogus reforms happen, then they would be in a good position to leak Feinstein's phone calls from last week.