Usually I guess who dies each season but I don't know, its kind of pointless. I figure there's a core group that's almost untouchable (Jack, Kate, definitely, Sawyer, Locke even though he's supposed to be dead, and maybe Hurley) but you never know with this show.

One thing I heard somewhere is they try to make Locke like the Jesus figure of the Island, Jesus was resurrected after three days, and supposedly Locke will too (at least symbolically) hence the reason why Linas only has 70 hours to get everybody back to the island.