You are correct in your expectations of all these things because they are a promise from God.<quoted text>
The earth was made for a purpose. It was made so earthling man could enjoy life, and that purpose was damaged by Satan and Adam and Eve. Mankind will remain. But bad people will not remain. Psalm 37 says that. Revelation also says that The earth will become a beautiful place to live in, just as God intended from the beginning.
Revelation 21 says "Then I saw a new heaven and a new earth, for the first heaven and the first earth had passed away, and there was no longer any sea. I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband. And I heard a loud voice from the throne saying,Now the dwelling of God is with men, and he will live with them. They will be his people, and God himself will be with them and be their God. He will wipe every tear from their eyes. There will be no more death or mourning or crying or pain, for the old order of things has passed away.
He who was seated on the throne said,I am making everything new! Then he said,Write this down, for these words are trustworthy and true.
So I know from putting the scriptures together that there is a beautiful new earth coming. Mankind will never be destroyed, just as Noah and his family survived the flood, so will some among mankind also be preserved alive through the foretold fire of destruction, laying bare the elements. No, God's purpose will be fulfilled, just as He made Adam and Eve, He will have a beautiful new earth for its residents.
However, it's your perception of these things that needs to be more accurate. You have unfortunately limited the fulfilment of these things to the physical world. But God hasn't.
Also contained in the very same words that you are reading in the Bible is the knowledge that the new heavens and earth are New Jerusalem. Old Jerusalem has passed away.
This New Jerusalem is the city of God that Abraham and Sarah were looking to. A city not made with human hands. This city is in heaven. It has real foundations because it's Builder and Maker is God. It will last forever unlike those cities of men which deteriorate with time.
In time you will understand what I'm saying as you continue to read and study the Bible. As one of Jehovah's Witnesses there are certain passages in the Bible that they would rather not be in there because they bring up more questions than answers. But they must be addressed if we are completely understand the bible and our future.