There are over 100 passages in the New Testament indicating the imminent fulfillment of the "last days" and Christ's second coming. In contrast, there is not even one verse that hints at these things being delayed. Some people have attempted to find a delay in Romans 11, but a careful reading will show otherwise. For example, many people read Romans 11:26 and interpret it as if it said, "and after this all Israel will be saved." However, it really says, "and thus all Israel will be saved," explaining in what manner "all Israel" was currently being saved. In Revelation 1:1, we read, "The Revelation of Jesus Christ, which God gave unto him, to shew unto his servants things which must shortly come to pass;" The Book of Revelation was not about the distant future or about things that God was about to postpone. Rather, it was about things that "must" shortly come to pass. There was no stopping these things.
It seems that just as the manner of Jesus' first coming was contrary to the expectations of His contemporaries, the manner of Jesus' second coming has been contrary to the expectations of the majority of Christians. However, a careful reading of Isaiah 65 and 66 clearly shows that the new heaven and new earth were prophesied to come at the destruction of Jerusalem and the establishment of the Christian church during the 1st Century. The new earth is the Christian age we are currently living in. It is the age of grace, the eternal age of Messiah where His kingdom is continuously expanding (Isaiah 9:7).
I don't plan on writing about Preterism, but I have provided some links below to books and other information I have found helpful.
The Parousia by James Stuart Russell (published in 1887, it is a standard introduction to Preterism.)
What Happened In 70 AD? by Ed Stevens
The Final Decade Before The End by Ed Stevens
International Preterist Association by Ed Stevens (This link points to an archive of podcasts.)
Where was sin defeated? Debate between Kurt Simmons and Don Preston (This is an important debate between two Preterists. Simmons is an "individual body view" Preterist and Preston is a "collective body view" Preterist. It is my opinion that Simmons decisively defeats Preston in this debate and shows the errors of the "collective body view.")
The Berean Preterist by Richard Eckhart (This is Eckhart's Youtube channel where he exposes the errors of the "collective body view" of Preterism.)