I've just had a thought, it's been proposed that the flashsideways universe is one where the characters get to improve their lives only in one thing that matters to them the most, although there is a price they had to pay, but maybe the price is that they have to give up their main obsessions? Locke gets Helen and a better relationship with his dad but he has to give up his obsession with having a great special destiny, Sayid has a life where Nadia is alive and well but he has to give up his desire to be with her, Sawyer gets to be an upstanding citizen but only if he eventually gives up his obsession for revenge, Ben gets to have a good relationship with Alex and his dad but has to give up his dreams of power... Jack seems more laid-back, maybe he is not obsessed with "fixing things up". I'm not sure how that would apply to Charlie, or to Sun and Jin, since we haven't seen their flashsideways yet, or how it relates to Kate, but her story still has to develop. (It's probably early to judge the fate of all of the other characters as well, since we're still to see what happens to Sayid, Sawyer, Miles etc. in other people's FS.)