Fairytale

A children's play about a crippled boy called Marcus who wishes everyone in the world gets what they want. He then wakes up in a world where everyone in the world has had their greatest wish fulfilled - the blind can see, the lame can walk, the deaf can hear, the sick are healthy. Marcus was a poor crippled child with no parents who is now a rich beloved prince with his dear mother ruling by his side.
Marcus got his wish.
Unfortunately, all of the evil people in the world also obtain their wishes - control, domination, power.
As the world starts to become corrupt, people are coming to find Marcus to bring back the old world.
What should Marcus do?
He has everything he wants. Can he give that all up? Can he go back to being a crippled poor child?
Is it his right to change things back to the way they were?
Does he even have the power to return the world to the way it was?
Why did this all happen? How?