i agree.Giovanni Casanova said:The whole "It's all a dream/hallucination/mental breakdown" thing has been played out -- from "The Wizard of Oz" to "Saint Elsewhere" to "Newhart" to the aforementioned "Identity", and I don't think that such an innovative series as "Lost" will end with such an unoriginal, cliche ending.
fyi, henry gale (the name Ben uses when he was captured by the losties) was dorothy's uncle in the Wizard of Oz (you probably knew that, just stating for other readers). which is yet more hinting that all of this is a big con / delusion.
i myself hope my theory is wrong and they come up with some kind of truly genuine, plausible and creative ending.
but all the 'clues' they are dropping so far all point to the story we are watching being a big con and most of it is in Jacob's head.