Can God reverse the fall of man specifically on earth?

Life for humans (Adam and Eve) before eating from the tree of knowledge was extremely different - as there was no sin in the physical earth. > Before that time, the two were separate, and evil had only a nebulous > existence in potentia. Then, eating from the tree of knowledge cursed the rest of humanity. Now, it is also "known" that God has the **power to do ANY thing**. Can God allow humanity ever get back to that previous state (***i.e. - we all obey Him perfectly***)** here on Earth** or is it never an option and why won't He?