Brian Simmons "To restrict such fulfillment to the events of A.D. 70 results in Universalism, for it teaches that the wrath of God has already been exhausted, and therefore can no longer be applied to the enemies of God. But if we simply keep in mind the true meaning of the term "this generation" (Matt. 23: 36) all difficulties will be cleared up. It is the generation of evil-doers to whom our Lord is speaking; and he sets these grievous woes over against special promises offered to the saints: that the people of God, while called to lay down their lives, will ultimately prevail through their Savior JESUS CHRIST."
http://preteristmuseum.blogspot.com/2008/05/this-generation-continues.html