As Jack lamented in that final scene of the season, the Oceanic 6 isn't going to be an easy bunch to wrangle up for a return trip to the island. Sayid and Hurley should have no problem being convinced to go back. Sun, I believe, will have been told by Bentham (or someone who talked to Locke upon his return) that Jin is indeed alive, which will eventually convince Sun to go back. Kate, however, is the biggest issue. As evidenced by the first scene in the finale, she didn't really take Bentham's visit to heart, and seems content to stick with Aaron at her home. Also, it would be a violation of her court agreement to flee the country. Also also, there's creepy Claire telling Kate not to take Aaron back to the island – but he's an Oceanic 6 member, so he has to. Unfortunately for Kate, neither Ben nor Jack are likely to give up very easily. My bold prediction: Kate and Aaron will be kidnapped and taken to sea their will.
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