The Book of Revelation is to be understood cyclically and figuratively. That is, its symbols remain symbols, and the judgements are reinforced by repetition. If we take the book chronologically, then we reach the end of the story at 11:14-18.
After Christ reigns for 1,000 years over glorified saints who came back from heaven, multitudes led by Gog and Magog rebel against God! Where did all these wicked people come from? Does this mean that in the perfect age to come, glorified saints will mingle with sinful people?