What Might Happen When Milo's Story Ends?

       I am still reading "The Phantom Tollbooth" by Norton Juster. Milo, the main character, has finally gotten to Digitopolis, where there is a number mine (in this story, in order to get numbers, you have to dig for them in a number mine). He is learning all about how to mine for numbers. My prediction is that I think Milo is going to get the permission of the Mathemagician (the founder of Digitopolis) to go to the castle in the sky, where Milo will rescue Rhyme and Reason and make that world safe and happy again. Then he will magically find himself back in his own world having found a lesson. So far, my only guess for the lesson is everything can be interesting, but only if you make it interesting.