I think most modern approaches to eschatology start on the wrong foot, namely, Revelation 20. I'm not seeking to be a trendy deconstructionist here, but seriously, who defines a theological position out of six verses in the Bible. The only place in the Bible that clearly talks about a "millennium" is Rev 20.1-6. Yet, from this text you can have postmillennialists, several kinds of premillennialists, and a couple kinds of amillennialists. How absurd. Of course Rev 20.1-6 matters. But state with clarity the eschatological kingdom realities replete in the gospels and in St Paul and then maybe you'll have a healthier frame of reference for interpreting John's Apocalypse.
So, because St Peter says that Jesus left us an example of suffering [1 Pe 2] and because persecution was an assumed part of most first century Christianity, I can deduce that any eschatological position that wants to avoid tough times might not be the most faithful to the flavor of biblical Christianity.
So, goodbye pretribulational premillennialism.
Furthermore, to say that the gospel will spread and spread to the point of near-global takeover is to fall off the other side of the horse. We are ambassadors who wage war [Eph 6]. We will continue to wield the sword of the Spirit until Jesus' return.
So, goodbye postmillennialism.