Without questioning the evacuation decision, I do have to wonder about those who are stating they would start their own evacuation. If the left engine is still running at idle power (just an assumption), which exits, if any, are safe to use to evacuate? My best guess is that maybe L1 would be safe, as it should be far enough forward to avoid being sucked into the air intake. I would worry that all other doors are unusable with an engine running -- those behind the engine might have their slides blown over by the jet blast, and those just in front of it might result in being blended by a GE90-115.
I'm not convinced a safe evacuation is *possible* without the cooperation of those in the pointy end.