Yes it's going to come to that. Our ancestors had to periodically beat back this horde for the same reasons. I don't think people fully appreciate how precarious the situation was for many centuries. Had Charles Martel not stopped them at Tours, they would have likely had at the very least a permanent foothold in western Europe. The later Enlightenment and Renaissance would have never happened and we would be living in a medieval caliphate.
I've seen a few other places where people are openly wondering whether some body like the Catholic Church could ever call for a Crusade. I don't know from where the call might come, but I have this -- for lack of a better word -- "urge" for something to reunite Christendom in opposition to these demons.