After watching last week episode, did anyone notice how freaked out Hurley was when he showed up at the construction site for The Hatch. Saying this is the placed that caused the plane to crash. I believe Hurley is going to try to disrupt the construction of The Hatch so their plane never crashes on to the island., but some how is gonna fail and cause them to push a button to save the world.
More evidence I believe Hurley is gonna be involved is that he is already trying to change the future by being the one who writes Empire Strikes back. Somehow he will be involved.