I think this depends vastly on the number of rogue tor nodes. However, picture this: NSA isn't the only organization going after TOR right? Probably there are others.So if you are China, Iran, Syria, Russia, etc. What do you do? You set up your 'own' poisonous tor relays. What you end up doing is disrupting and diminishing the potential of a single agency or a group of agencies of controlling a big % of tor traffic.

So all in all, might be a good thing and way more difficult thatn it was 7 years earlier. Not to mention that at the time we were browsing through tor at 50 kb/s while now we browse at 400 kb/s.