What role will Peter Bishop have in Fringe?

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For those who have been tracking Fringe's series, the last episode happens to show how Peter disappears after explaining how both worlds can survive. However, he disappears before anything else is revealed. I've read in a blog that Peter may actually turn out as one of the bald guys in black suit (observers)? Does that mean he and Olivia can still be together? Do you think Peter Bishop should be an Observer? Share your thoughts.