I also believe a great revival will come, but not until we go through some serious tribulation first. I think the tribulation will be the catalyst for the revival. Many will see terrible events and it will cause them to repent. This is part of God's mercy. Many people see the tribulation as a horrible thing, but actually it's merciful because God is showing and warning us and giving many more time to repent and come to Him before He destroys the world. The tribulation is part of His patience and warnings.

Just my thoughts....