I think it's possible to effectively and creatively alter Lost whereas certain characters can combat "The Others" off the Island. Here are a few of my ideas:

- At the end of Season 3, Ben makes good on his promise and allows Jack to leave if he promises never to tell anyone about the island. Jack agrees and is sent away in a scene reminiscent of the way Michael and Walt were allowed to leave.

- In the beginning of Season 4 we see Jack back at his home peaking out of his window at the men in a black van who are monitoring his every move. He finds out that his phones are tapped. He carefully figures out a way to evade the men who are following him and contacts Michael.

- Back on the island, Sawyer leads his fellow castaways in a mission to find Kate, Sayid & Locke, who have been captured by "The Others".

- Jack and Michael, who is also under surveillance, work together to try to figure out who is behind the surveillance and who is the leader of "The Others". One of Michael's close friends, who is a detective, and one of Jack's close friends are recruited.

- Sawyer's group manages to free the captured castaway's during a vicious battle that leaves several of them injured. They all manage to escape but they are forced to separate into 3 groups while being chased by "The Others".

- Towards the middle of the season, Ben shows up at Jack's house. He tells Jack that he knows what he's been up to and if he doesn't stop he will make sure that all of his friends on the island are eliminated. Jack is shook up and tells Michael and the two other people involved with them that it's over. During this same episode, the castaways who were split up into 3 groups are reunited and regroup. They plan to wage one final battle against "The Others".

At the end of this episode there's another knock on Jack's door. It's Desmond. He tells Jack, "I know what you're thinking brother, but you're not going crazy. I'm not really here at this moment... but I am. If you stop trying to uncover the truth it will be a big mistake. In fact, it'll be the biggest mistake you'll ever make in your life. Our lives aren't the only ones on the line, brother. If you fail everyone dies. Everyone."

Maybe I'll add to this later.