Each will respond to the death of his or her fantasy in his or her own way, or course, but many, I would think, will become dispirited and leave their church.
At that time, some will be seeking, and teachable, and we will need to welcome them into our communities and help them get over it.
I think we need to keep our eyes open for these people, because once they are freed of this fantasy that has overwhelmed their lives (and their reason, imo), they will turn in different directions, some will end up in the reality based world.
They will be traumatized, and some of us hopefully will be able to help some of them to heal.