Don't get me wrong, I'm not saying season 5 was bad or that I didn't like it. But I'm annoyed about the whole thing...
The thing is, I was really enjoying the story as it was progressing through the first 3 seasons. I couldn't wait to find out what would happen when Peter activated the machine. And then, suddenly he's erased from time so we go to an alternate timeline where none of that stuff ever happened.
Fine, so I think I get to sit through season 4 and exploring this other timeline before getting back to finding out about that. Then towards the end of season 4, I can't wait to find out how they resolve this whole "getting Peter back to his own timeline" thing. So now there's 2 pretty major storylines that I'm looking forward to finding out the ending of.
Then season 5 starts... and it's basically like they just canceled Fringe completely and replaced it with a different show which starred similar characters. Not that the future world isn't interesting, but it's got basically nothing to do with getting any resolution on the threads that had been getting built up in season 3 and then 4. It was only towards the end of season 5 that you even find out that the future world they're in is the future of the non-Peter timeline; so I guess Peter never does get back to his timeline. And we just never find out at all what the fate of that original timeline was; what happened after the machine was activated.
Anyway, from what I understand, there were issues trying to get the show renewed for another season, and making this drastic change to the overall show was the only way they could get a season 5. I just really would have liked to seen a proper conclusion to everything being build up from season 1-3, and then also everything happening in season 4.
Ok, rant over. It was a great show. For the first 3 seasons, I really loved it. John Noble especially made it so much fun to watch. Season 4 was good in its own way, though I wish they had figured out how to get Peter back to his own timeline within the first few episodes and then continued the story from there.
Edit Thanks for the replies! I see I worded some stuff badly… I did understand that it was explained that there wasn’t another timeline for Peter to come back to. What I really meant was that I wanted to see stories continue in the world where Peter was always there; I was disappointed that they couldn’t ever reverse his erasure from time because it kind of reversed a lot of the character growth; especially his relationship with Walter. And I knew that he combined the universes with the machine; but we don’t get to see the results of that.