Ok, maybe not completely inevitable but as LOST continues with a looming deadline, then the range of possible plot lines begin to narrow. Sadly for many naive viewers, this means that a few questions will go unanswered, much like the eternal question of socks and dryers.
WARNING!! MAY CONTAIN SPOILERS AND IF I'M RIGHT THEN A LOT OF SPOILERS. Definitely contains a lot of name butchering since I'm too tired to look up the correct spelling of names for these fictional characters.
However, I'm guessing quite a few questions will be answered if they haven't already. Let's start with what we know.
1. The island is a great place that everyone keeps coming back to. In the last episode we learn that Miles is actually from the island and strangely enough has the ability to speak to the dead. Coincidence? I think not. This only reinforces the rule of all must return at some point and that children are impacted by the island in weird ways.
Potentially this means that Naomi was from the island originally as were other members of the mercenary crew including Faraday. It also means there is a good chance we'll see Aaron or Erin, you know Claire's baby, and Walt show up on the island at some point with some killer Firestarter like powers.
2. We know that the survivors in 1970's dharma village will have to return to the future. Odds are that Daniel Faraday will lead them there since he is the most knowledgeable about time travel. Why? Because you have to join everyone up for the finale. There is a good chance that someone will decide to stay in the past because they like it there better even though they know they will die. Also a good chance someone will have to sacrifice themselves for everyone else to get to the future. Could be the same person, not sure yet.
3. We know that the Dharma people weren't the Others and that they weren't from Whitmore. This one threw me for a loop, but it is important because you have to ask where did they go? The Other's led by Ben killed them all off, but surely they didn't just give up on finding the Island again and all of their experiments. For a long time I had assumed that Charles Whitmore was responsible for the Dharma initiative. However, in episodes 11 and 12 we find out that Charles was a leader of the Others during the Dharma initiative. I think the new terrorists on the Future Island are the old Dharma people back for some revenge.
4. Terrorists? Yes, during the many time leaps from earlier Sawyer, Juliet and others find an outrigger canoe. They start paddling and then getting shot at by some weird group. Juliet explains they are terrorists that they have been fighting for years. The outrigger is the commonality here. The outriggers are sitting on the beach when the second plane crash occurs. A weird group suddenly emerges made up of the woman that had arrested Sayid (sic) and few other randoms. They apparently id each other by asking "do you know what lies in the shadow of the statue?" This is the same group that approaches Miles before he gets started on his little trip and reinforces that we're dealing with at least 3 distinct groups. Others, Whitmore and this Statue terrorist group. The Dharma people could be a 4the group, but plot wise it would be a lot easier to just make them the Statue terrorist group. Oh and apparently they have something really cool in a gigantic aluminum case. My first thought was a bomb, but seems unlikely considering they would have to get it through airport security, etc. I'm guessing it's a survival kit with food, water, communication gear and some kick ass terrorist costumes.
5. We know the island provides a fountain of youth of some sort. Whitmore should be dead or close to it since we see him as a young lad during WWII during the time jumps. Instead he's in fairly good shape all the way to the 70's. Then suddenly he's old because he gets kicked off the island. We know Richard is timeless and on the Island a lot.
So what does all of this new found knowledge get us? Well the past losties will try to re-unite with the present losties (can you say "Back to the Future?") and will have to deal with the new terrorists, most likely all of next season. During their many intense battles where people will die, the truth about what they're all fighting for (eternal youth provided by aliens or "gods") will come out. It's at this point that Jack will realize some meaning in his life and lead/save everyone all at once.
It's my theory and we'll see how well it holds up. I'll update it once the season is over.