I'd say that is an awful lot of land when it comes down to it being under the control of a terrorist organization. That map makes it look like 1/3 of Syria is under ISIS control. The problem isn't the land ISIS doesn't control, its the land that it does control; and yes that land will definitely grow if the rest of the world stays uninvolved.
https://qph.is.quoracdn.net/main-qimg-47c557433f9fce6e0989d9830f457ba6?convert_to_webp=true (Unsupported image host)
Faces of civilian Syrian refugee children who would be either vaporized or possibly subject to long-term radiation effects from your "nuke" option, are below. (And this is just but one random photo; it doesn't include the hundreds of thousands of others, if not more than that even, of random civilian people, men women and children, non-combatants, who are already having a bad enough life as it is, who would be effected by or annihilated by a nuclear weapon detonated in the region).
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Didn't even reference nuclear warfare anywhere. Someone else did but they are probably just 12 years old and have been playing too much Call of Duty. But yea, using WMDs anywhere is pretty bad and at this point their only use is to keep the world in a state of mutually assured destruction is one was used.