Well no, at the end we see Claire, Sawyer, Kate, Miles and Lapidus lesve the island too. So they got off the island and survived and led a normal life too. They died off the island but the ending was showing that the happiest times of their lives where when they were with each other so they were all waiting for each other in purgatory. Walt and Michael weren't there because obviously that wasn't the happiest time of their lives, but I still don't get why Desmond and Penny were there or Aaron because Aaron's happiest moments would have been off the island