Julliet told them in the beggining of Season 6 that they Succeded with something by blowing up the island. The show had several 180° U-Turns Since then and even before that point once or twice. The most things were unimportant like Kimi got paid to Kill Jin or Sawyer being a Cop. The biggest U-Turn was the SCI-FI angle was turned to aSupernaturall angle. What was the thing with the Electro Magnetism and Desmond? How did he get the afterlife knowledge? It all Seemed as a alternate timeline until Christian Shepard arrived and began explaining.
So the most important question was way blowing up the island if there's no alternate timeline? Ofcourse their time travell had to culminate into something big because without blowing up the island all the time travell was for nothing. And they had to have the time travell because everything was building into that for 3 Seasons or so.
This ending wasn't even a candidate when the story began. I am quite sure they had no idea the first 13-14 episodes of season 6 that they were going end things like that because 99,9% of the story was building into another ending. However 99,9% of the fans were sure it was an alternate timeline and that's why they had to end things with a twist like that to make the 99,9% of the people wrong.
This twist could have worked if it would have been baked in to the earlier story line. Howerver this late twists never work because there already is to mutch story you would have to undo. Obviosly the writers have the power to end the story however they want but they still need to use the story from the earlier seasons to make it work. It's like building a puzzle, you always start with the corners and you cant change the middle of the puzzle when almost the whole puzzle is ready.
They had a big twist, the biggest twist in the history of television. however the story didn't fit at all. It's like killing of a major character with a bullet to the head and in later episodes try and explain it was just a through and through to the shoulder. It's like a character is running into a bulding with blue Jeans and when he enters the building he suddenly has a pink skirt. The blue Jeans/pink skirt switch would acctually be more forgiving.
Lost would acctually be better if they had axed it after season 5. The story would fit and we could have made our own ending in our imagination. Because this ending was a joke. It seems like the person writing the ending didn't se any of the earlier episodes. It seems he didn't even try to talk to the people who wrote the earlier episodes or even people who only seen the earlier episodes.
No matter how funny the Kimmel alternate endings are, any of them would fit better. Sure it was very touching with people crying saying they love eachother and Jack giving up his life for the Island. Sure it was very emotional however it didn't fit, it's like trying pushing a cirkle puzzle peace through a hole for a triangle. Saying the writers are genius is an insult to normal people.
With other words I could have watched the Pilot and the finale and jumping over all the episodes in between and it would have made more sense then now. I now am sure they made up the story along the way, and it's dangerous with many writers because they often forget things other writers are trying to make important. I am quite sure the writers keept talking to eachother to a minimum. It's like one person i starting to tell a story and then suddenly another person resumes and then another and another. You know when in school we did this thing the teacher started with a story nobody had a clue what it was about and then a random student had to resume telling this story with his own words. The story took a new direction for every person that resumed.
Lost seems like a story like that and with this ending you either have to change everything inbetween or the ending to make it fit. This was really dissapointing...