Apparently you don't read Acts 1-7 very carefully. The apostles and disciples did believe He would return soon and demonstrated their belief by selling all they had and sharing with others of the "little flock" of Jewish believers. This was a "foretaste" of the kingdom they were preparing to enter. But following the rejection of God the Holy Spirit by the stoning of Stephen, God placed His program with Israel on temporary hold, per Romans chapters 9 - 11. Instead of beginning the pouring out of God's wrath, which was the next event on the prophetic calendar, God instituted a new program of Gentile grace. This resulted in delaying the kingdom program some 2000 years now.
To believe the preterist view is to use extra-biblical information rather than the Word of God. The Word is clear as to why God is now dealing with Jew and Gentile on equal footing rather than dealing with the Jew only. Unfortunately, people read the Scriptures, or more likely, what someone has written about the Scriptures, with biases that cloud and distort the true meaning. If 70 AD concluded the Jewish program and God said the church, the Body of Christ is now Israel, why does John not mention this in the book of the Revelation? There is nothing in Scripture about the destruction of the temple in 70 AD, therefore any meaning attached to that event is based on the will of man, not of God, and is from extra-biblical sources, such as Josephus. You know what it says about adding to the Word of God!