Saying "the church (ekklesia) isn't mentioned in Revelation (after chapter 3) by name, so therefore isn't there" is like saying "God isn't mentioned by name in Esther, so He isn't there." It's an argument from silence. The explicit teachings of Matthew 24; 1 Thessalonians 4; 2 Thessalonians 1 and 2 come before inferences. 

-Gabe Cali