Rosberg escapes a penalty for going straight on to stay in the lead, almost loses it on an outlap, has a terrible stop, has the same reliability issues as Hamilton, yet he's on course for a win while Hamilton is out of it? What a farce. I'm done with this race.
Rosberg was going to stay in the lead at that point anyway, Hamilton was not near enough to overtake him.
Giving a 5 second penalty for this as others have suggested would be OTT, he gained all of about a second in track position and it was clearly just a mistake. Were he to repeat the mistake, then sure give him a penalty. But he didn't "go off the track to stay in the lead", he was staying in the lead at that point regardless.
Great race anyway.