According to the Bible, what has to happen before Jesus comes back? World War III? The rebuilding of the Jewish Temple where the Dome of the Rock now stands? Jews flocking to faith in Jesus? Global evangelization? An earthquake big enough to detach California from the continental United States? A one-world government? Worldwide mass-imprisonment and -murder of Christians?
(Answers: Some yes, others no.)
How about the Church purified into mature Christlikeness?
Read this great article by Francis Frangipane. No view of the end times is complete without the concept he discusses there.