Last Episode Season3

So, in this episode we are brought to the future and witnessed the consequences if Peter chose to destroy the other side.
The consequences were that Peter would loose Olivia as she'll be killed by Walternate and so Walter told the grieving Peter that he could change the 'future' if he would change his decision.
We then jumped back to the present where Peter had just entered the machine and made his decision to save both worlds.
He brought both worlds together in the hanger and as it goes, Peter disappeared with the episode ending at the scene where The Observers mentioned Peter never existed and has served his purpose.

So now it only poses more questions than answers as to why Peter would disappear and what will be happening in Season 4. How are they going to repair the damage caused?
There is also the question of Peter's son with alternate Olivia and what would Olivia do when she finds out?
Can't wait!

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