We don’t know when - but ISIS is on the move very quickly. And, if I understand the BIble - most of the time destruction is caused by invading armies. So, I believe this will be the case - war will break out - especially, if they try to attack Israel. Why are you so skeptical? Bible prophecy is being fulfilled right before our very eyes.
Because God has been known in the past to slow things down, or draw them to a halt even......things are not always what they might appear to be.
Additionally..there’s a whole lot of other things that need to be in place which aren’t as yet. Moving toward, but not there.