It's possible as there will be only 16 episode/season from now to 2010 ...
I don't know how they will last three seasons more but, from what I saw in season 3, they are not lacking imagination and it was a very good one IMO, maybe better than season 2.
Now, as someone pointed out in a french forum, I wonder if it was real flash forwards as Jack talk about his father twice as if he was alive while he's supposed to be dead ... Maybe he lost his mind
