Considering the producers have flat out said "we will not explain everything" I think it's safe to say this show is going down the ter.

Predictions: Jack and Kate are Adam and Eve; Locke's "soul" or w/e wins over Smokey; big finale and an OMG THEY WERE ALL MEANT TO BE THERE FOR NO REASON REALLY AT ALL JUST BECAUSE. Christian and all the apparitions = smokey who was guiding them all along for no particular reason that actually won't make retroactive sense; uhhh and uhm if Jacob lived under the foot then who was in the cabin? Smokey obvii, but uh, that doesn't make sense either so oh .

I highly doubt stupid like Hurley's bird or "omg the others don't leave footprints" will ever be explained.