After God's kingdom is established, will it ever be interrupted?
Yes, the kingdom will be interrupted briefly when Satan is released for a little while, but that interruption is temporary. Afterward comes the new heaven and new earth, and God's kingdom continues on into eternity; His dominion shall not pass away and shall not be destroyed.
Les explains that God the Son comes before the Ancient of Days, God the Father, and is given dominion, glory, and a kingdom. This occurs as He is about to return to earth and smite the Gentile empires that have been on human history for 2,600 years. He destroys them, they disappear from view, and He sets up His kingdom—a dominion that shall not pass away, it's eternal. Les notes it will be interrupted again when Satan is released for a little while, but then comes the new heaven and the new earth, and the kingdom just continues on into eternity. His kingdom is that which shall not be destroyed, and He has His rule and reign.