Do you like happy endings? If so, Hunches and Bunches has you covered. After a grand kerfuffle of hunch bunching, the boy finally finds the hunch he wants. But what are we to make of this transformation? We have no idea. Let's see if we can find out.
After the Hunches have had their say, a Super Hunch informs the boy: "Only you can make your mind up!" (25.3). But the boy doesn't believe he can accomplish this task all alone, so he multiples himself to argue the issues with himself (yes, you read that correctly). The argument goes as follows:
It took an awful lot of me.
It took a lot of yelling.
It took a lot of shoving
and hot bargaining and selling. (30.1-4)
At the end of the session of self-arguing, the boy decides to go with a Munch Hunch, "the best hunch of the bunch" (32.2). The house returns to normal, and we don't see the Munch Hunch or other boys anywhere.
Although you might have guessed it before, the fact that the Hunches disappear once the boy's mind is made up strongly suggests they didn't exist in the world outside of his mind. Hey, it might not seem like a great revelation, but this is Dr. Seuss were talking about here. Take nothing for granted.
Beyond that, the story provides a classic happy ending. The boy was provided with a dilemma: not knowing what to do. The dilemma led to a conflict within the boy's mind as represented by the Hunches. And the conflict came to resolution when the Munch Hunch won out as the boy's chosen victor. Boom—happy ending.