In the end, it wasn't Inuyasha and his flurry of attacks or Sesshomaru with his powerful Bakusaiga that brought Naraku to his knees. It wasn't Sango's Hiraikotsu or Miroku's all-consuming wind tunnel. It was Kagome and her arrows that rid the world of one of the greatest villains it would ever know.
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In the end, the wish on the jewel was a simple one. It didn't take wishing for power or money or beauty or immortality for the Shikon-no-tama to vanish. It didn't take wanting to be a full-blooded yokai or a 'pathetic' human or to bring about world peace. All it took was for Kagome to make one single wish: "Shikon-no-tama, disappear. Forever." And with those words the legendary Jewel of Four Souls, which could grant power to anyone or anything with yokai blood, disappeared from the world for eternity.
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In the end, all it took for the well to reopen was one modern high school graduate's wish to see her beloved hanyou again. Not a wish to visit with her friends. Not a desire to go to a time where the air was cleaner and the sky was bluer. No, she only had one thought in her mind at that time: "Inuyasha…I want to be with you." And with that one thought, the well reopened one last time, for a long enough span for her to travel between the eras one last time and go back to her hanyou, her koi, her Inuyasha.
And in the end, that's all that she could ever want or need.