Will the entire earth become like the Garden of Eden again?
Yes. After Satan is defeated and the curse is lifted from the planet, God will renovate the earth and prepare it for the Kingdom. The whole planet, not merely a small area, will revert to a Garden of Eden condition, and it will be glorious.
Les explains that the tribulation judgments and cataclysmic events ultimately pay off Satan’s mortgage, pictured in Revelation chapter 5 when the scroll with its seals was opened. Once Satan is defeated and the curse is lifted from the planet, God will accomplish a renovation project in short order and make the earth ready for the Kingdom. When Christ returns, He will set up His Kingdom on earth. The earth will be brought back as it was in the Garden of Eden, not just in one small area, but the whole planet will revert to a Garden of Eden situation. After the seven years are consummated, Christ returns, destroys the remaining armies and all those still in rebellion, the earth is brought back to an Eden-like condition, and then comes the thousand years. Les also reminds his classes that the Kingdom was spoken of and prophesied throughout the Old Testament, but it is not until Revelation that a time frame of a thousand years is attached. The Old Testament speaks of forever; this Kingdom is going to be eternal.