Islamic State’s‘caliphate’ has been toppled in Iraq and Syria. Why isn’t anyone celebrating?

Basically, we see ISIS is changing from an Army to an insurgency....
“That should be worrying for the U.S. and its partners in Syria because it speaks to the degree to which ISIS can seed its operatives, all local Syrians, into the security and governance structures that are currently being built to replace it,” he said.

Of particular concern are the parts of eastern Syria where the fighters have set up base.

Heras said that region, which abuts Iraq, “will be a sea of turmoil as ISIS ramps up its insurgency mission over the coming months and years.”