I know guys, I know it's been overly discussed. But just one last comment on the reset possibility:
IT DOES NOT MAKE SENSE.
I mean, Jack said to Eloise that if they succeeded, she would never murder her own son, it would all change. But, what the hell? If they do change the timeline by creating, say, an alternate universe (like the new Star Trek movie), still, things would change only AFTER the explosion. The timeline would split into a new timeline only after the changing point: the jughead. So, Eloise would still kill Daniel, who would've come from the "prime" Lost universe.
And I still don't buy alternate universe. I still think they would try to alter the timeline of their own universe and fail. Because whatever happened, happened.