"Season 2, while not having quite as big an impact, has still been pretty top notch, so here's hoping the quality of the game does not dilute any further with the third season."
I feel like Season 2 is a little more impacting than Season 1, which obviously not as original. Characters still made tough decisions and faced their fears. Villains still made serious threats of murder, though the villain in Season 2 is far more despicable. Protagonists still had heart-wrenching moments of pain and/or exhaustion, though Season 2 made you act through the pain.
Is a Season 3 necessary? No. But hey, the series hasn't really gotten stale yet - at least, not as much as The Wolf Among Us.