The only problem is that it seems that the groups that have been on the island in the past have all had a purpose there. The people that were brought there, Juliet, did not want to stay. There are a few that want to stay on the island, Sawyer, John, Bernard and Rose, and a couple that want to go back, Jack and Hurley, but the ones that exist well there seem like they have always been there and have that connection with the island. The Island could be restocking itself, but that still leaves many questions unanswered.