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That would be because, theoretically, since they exploded the place where the hatch would have been built, it was never built and therefore desmond wouldn't have been needed to push the button. Now, he still may have crashed on the island, but there is no explanation as to what happened after that. Or maybe the events that followed the explosion led to him never having crashed on the island. Who knows.
I have a feeling that there is no way they can answer ALL the questions by the end of the season.