I have often wondered if Jesus deliberately used Hyperboles to obscure his meaning.
I can say to my wife that I will love her until the moon is no more. She well knows that I will love her forever, not simply until earth's nearest satellite crumbles into dust.
Jesus said, "and I will be with you all the days until the conclusion of the system of things." Did he mean the world would end? Or did he simply mean that he would not be going away from his followers ever?
Likewise the good news is being preached in all the earth, and then the end will come....
Since the number of people in the world keeps on growing the good news will never ever end and it is assumed that neither will the gospel's true message.
If these are hyperboles nobody in their right mind would take them as anything else, except for the Jehovah's who honestly believe that if they keep on preaching the end of the world will come!