What if MIB destroys the Island?

Does MIB then destroy Mankind? Would any flashes into the future, become null and void? Was the time shifts between the "Losties" the only ones that ever happened? It always turns out the same? Not this time...If MIB doesn't destroy the island, is that the difference? Hopefully this time Jacob and progress has enabled our favorite islanders to be able to fend off MIB and his smoking habit...

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