I think it goes without saying that there was no way to end LOST that would make everyone happy. That is why, imo, they did not give a difinative answer. They left it to the viewers to interpert it. And this morning, I had a revelatoin and made my peace.
At the beginning of the season, dead Julliette told Miles that it worked and we get the flash sideways where the plane doesn't crash. But we still have the folks left in the flash forward on the island. That has to be resolved somehow, because you just can't have people living two different lives. Then it hit me, you just can't have people living two different lives. It's really that simple.
All Jack had to do to get on with his flash sideways life was to let go of his flash forward life. So of course in the end, he died.
At the beginning of the season, dead Julliette told Miles that it worked and we get the flash sideways where the plane doesn't crash. But we still have the folks left in the flash forward on the island. That has to be resolved somehow, because you just can't have people living two different lives. Then it hit me, you just can't have people living two different lives. It's really that simple.
All Jack had to do to get on with his flash sideways life was to let go of his flash forward life. So of course in the end, he died.