I think the FB's will return because surely they cannot give us FF's every episode can they? Well assuming the Oceanic Six make it off the Island in S4 or S5 [in time to make it back before Lost ends; S6] that will be when FF's end and FB's return. Of course we could still have a few more FF's even then.
Who really knows - I think the Opener had a FF because that is where S3 finished. I think we will have FB's from this point onward; speculation of course. I hope FB's return for the next episode and beyond otherwise we will know too much about the future.
One interesting idea as a way to swerve us is a FF which shows Jack [for example] AFTER he has returned to the Island and AFTER he has returned to the outside world [AGAIN] if that makes sense. This way we can receive FF's but be swerved later down the road.
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Time is an illusion Right Place, Wrong Time DESTINY "When your life is forever defined by a single action, it changes TIME".
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