I don't understand. How does this negate anything that happened before season 4? People don't like that the Amber universe were different characters, now they don't like it when it's revealed that they're the same characters. No one is ever just satisfied.
If anything, this episode partly retcons the first half of the season, but not the last three years. But, I don't even think it did that. Peter is still the eye of the storm--he has been for the past 3 1/2 years, and he still is. He's the tie that binds everyone together. He was the bind in season 1, and he's still that bind.
Now, I wasn't feeling the MotW, because I didn't think that story went deep enough. Why was he scarred like that? What was his character doing other than "I just want someone to love me?" But, it does work with the overall theme of the show.
At heart, Fringe has always been a love story. And one of those loves has returned. We've already had evidence of true love bridging universes: the couple in "3B." Plus, there's the love that Walter had for Peter that he crossed over universes.
This episode showcased many of the different kinds of loves that we've had in the past, which is absolutely not negated:
We see the love of a father towards his son. We see the love of the son to his father.
We see the love between a man and a woman finally coming together again.
We have unrequited love (Clark Kent Lincoln).
We have the love that an outside has towards these people--September's people.
The themes have never changed. It started off with the love a woman had towards a man (Olivia to John) and the love of a father to a son. The only thing that has changed is who that man now is.
I don't think that anything from the past three years has been negated. On the contrary. Now, the first half of this season--maybe.
(I apologize if I don't make any sense.)
It negates the last 3 seasons because it means none if it happened. They had very different cases to the ones we saw, as evidenced by the fact that they had no idea who david robert jones was - meaning a whole 3 seasons worth of cases we saw resolved were not resolved, people weren't saved, murders weren't prevented, killers weren't caught, and most importantly, lessons weren't learnt. The character development that occurred through those 3 seasons is now irrelevant for everyone but peter and olivia, the character development that occurred for the half first of this season is now irrelevant for olivia.
And these are not the same characters - they are only the same in the same way that olivia and bolivia are the same, or walter and walternate. They are the same people who have lived under different circumstances, which have shaped their personalities in different ways. Which means they are now not the same characters we watched develop though 3 seasons, except for peter and olivia. And olivia is now not the same character she was a few episodes ago. It's all completely stupid.
I don't know exactly where they're going with the rest of this season, but if we don't see a blue intro very soon I'm done with this show.