Well, according to the Bible, mankind will never be "gone." That is not God's purpose. His Word states: “This is what Jehovah has said, the Creator of the heavens, He the true God, the Former of the earth and the Maker of it, He the One who firmly established it, who did not create it simply for nothing, who formed it even to be inhabited.” (Isaiah 45:18)
Not only did Jehovah create the earth to be inhabited but he also purposed that it become a paradise to be enjoyed by perfect, happy people. That is why the Bible foretold that there would be “a new earth,” a new human society, in which “righteousness is to dwell.” (2 Peter 3:13) And at Revelation 21:4, God’s Word tells us that in his new world, “he will wipe out every tear from [mankind’s] eyes, and death will be no more, neither will mourning nor outcry nor pain be anymore.” It is for such reasons that Jesus could speak of that coming new world on earth as “Paradise.”—Luke 23:43.