And so it ends, indeed.
Well, I have to say I really enjoyed the Fringe finale and I'm going to miss the hell out of Walt who will always be one of my favorite TV characters of all time. His emotional goodbyes to Peter and Astrid broke my heart. I wish he had one with Olivia, saying that she was the daughter he never had.
I love the returns of the cow and September's Observer leader, that Olivia got to use her abilities one last time, and that Windmark finally got what he deserved. But I'm sad that September died. I wished he could have spend more time with his son. At least, he has Walter to tell him stories about September.
The final scene felt like the right note to end the show on. It was emotional and left some air of mystery about whether Peter suddenly remembered at that moment the events of the deleted future, and what will the characters do now that the Observers won't be around anymore.
And the way I see it, in this alternate timeline, the Observers were around but they were deleted from the present along with Walter and Michael like Walter told Peter would happen. This should answer the question on the minds of those of you wondering why Peter would be still alive if September was erased along with the other Observers.
Like Joshua Jackson said, he doesn't expect the finale to satisfy everyone and considers that a good thing. I agree with him. The finale wrapped everything up and yet, I was left wanting more. I want to see more of Peter, Olivia, Walter, Etta, Broyles, Astrid, and Nina. Sadly, that can't happen and that is the marking of a good ending: giving us just enough for some level of closure while leaving the rest to our imagination.