I think Locke, Ekko, and (maybe Desmond) are still alive for a practical reason. Other than the 4 left with the Others, they were the strongest characters with the most development. Now that the cast is split into two parts, who cares about seeing what happens to Bernard, Rose, Claire, Charlie, et al? Even if Sayid, Jin, and Sun rejoin them, I don't see them as capable of holding much viewer interest.
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Cogito ergo spud -- I think, therefore I yam
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