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It’s hard to overstate how hamstrung the Islamic State will be by its radicalism. The modern international system, born of the 1648 Peace of Westphalia, relies on each state’s willingness to recognize borders, however grudgingly. For the Islamic State, that recognition is ideological suicide.
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Properly contained, the Islamic State is likely to be its own undoing. No country is its ally, and its ideology ensures that this will remain the case. The land it controls, while expansive, is mostly uninhabited and poor. As it stagnates or slowly shrinks, its claim that it is the engine of God’s will and the agent of apocalypse will weaken, and fewer believers will arrive. And as more reports of misery within it leak out, radical Islamist movements elsewhere will be discredited: No one has tried harder to implement strict Sharia by violence. This is what it looks like.
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That the Islamic State holds the imminent fulfillment of prophecy as a matter of dogma at least tells us the mettle of our opponent. It is ready to cheer its own near-obliteration, and to remain confident, even when surrounded, that it will receive divine succor if it stays true to the Prophetic model. Ideological tools may convince some potential converts that the group’s message is false, and military tools can limit its horrors. But for an organization as impervious to persuasion as the Islamic State, few measures short of these will matter, and the war may be a long one, even if it doesn’t last until the end of time.