Preterists believe that 70ad resulted in the passing of the law. Prterist believe the heavens and earth passed away in 70ad. Does this mean that ALL are now not under law? Does this mean that ALL are in the age of grace? Does this mean ALL are in the new covenant? Does this mean ALL are in the new Heavens and Earth? IF NOT, WHY NOT?
More on Heaven and Earth
In Matthew 24 Jesus predicted the destruction of the Jerusalem Temple, the very center of the Jewish world. Referring to the passing of that system, and in direct contrast to his world that was to be established, Jesus said "heaven and earth shall pass away, but my word shall not pass away," Matthew 24:35. You see, one world was to pass, the Old World of Law; and a New World was to be created, the World of Messiah. It will never pass away.
Hebrews 12:25ff spoke of the passing of the "heaven and earth" so that the unshakable kingdom might remain. It says they were at that time "receiving a kingdom that cannot be shaken," vs. 28. Since the heaven and earth were to be shaken/removed so that the unshakable could remain, and since they were at that time receiving the unshakable kingdom, it follows that the "heavens and earth" was being removed at that time! Again, not physical heaven and earth, but the Old World of Israel, created and sustained by the Law was about to be completely destroyed when Jerusalem and the Temple fell in 70 AD.
https://www.eschatology.org/index.php?option=com_content&task=view&id=34&Itemid=61