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In the intermediate term there's no other option. The "legitimate" government of Gaza is the Palestinian Authority to whom I suspect it will be returned in some form and at some time. Hamas wasn't elected in Gaza, they overthrew the legitimate government. They did roughly tie Fatah in the legislative elections (2005) which is usually referred to as "elected", but Fatah formed the government and governed Gaza until the coup. What other options are there? The UN? They're keeping peace in Lebanon as I write this. The EU or US? Probably the only alternative is Israel keeping order and some government being formed.
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But...but...occupation bad. Reestablish Gush Katif in the Philippic Corridor, then, and commit the troops and assets for constant vigilance. Whatever Sharon was thinking when he evacuated Gush Katif, it was wrong and didn’t work.