"I wish this world to become a mythological world. To be altered with imaginary beings replacing human beings. Or for the very large majority. I think the world would be better populated by fantasy creatures. Make it that only the very bad people are kept humans. Like that, they shall be hunted down by the others. The others will be changed depending on their characters, appearances, tendencies and morals."
"As you wish," Gaz simply said.
A great wind of magic erupted from the genie, spreading across all the surface of the planet. It altered absolutely everything in its wake. Communications were completely lost. Magic had replaced these but it would have to be learned from competent people. And this would take a long, long time. Rapists, bullies, thieves and the most disgusting members of the human race discovered to their horror that their relief at being humans was extremely short-lived. Transformed people, jealous of their 'luck' killed them out of spite. Others were given or sold to vampires who bled them dry, quickly wondering who would provide them with the precious delicious liquid of life if no more humans could be caught and had. The few that survived went into hiding, terrified at what they could do to simply survive and make the human race perpetuate itself. A whole world was after them to treat them as badly as they had treated others!
As for the rest of the world, it had to adapt to their new natures. In Finland and Russia, a lot became werewolves. In France's rich neighborhoods, vampires predominated, in Paris in particular. Florida, California and tropical locations become reserves of mermaids and other sea creatures. Entire dragon populations settled in woods, mountains and wherever they could. Scholars became magicians and warlocks, intent upon recuperating what could be salvaged from the old way of life. But clearly, if adaptation would be hard, the planet would benefit. Pollution and overpopulation had crashed and many had become creatures not resembling humans anymore, resorting to a more natural lifestyle. In a few generations, barely a single soul would remember or even regret the world as it used to be. Any return would be near impossible because even if a genie's lamp was found, why would anyone wish for a return to a world he or she had ever known? The chances of a being still holding nostalgia of finding a lamp and making a wish was very, very remote indeed. As for Gaz's lamp, it was at the bottom of the sea. Ryan had been spirited away into the sea in another corner of the world to become a merman and had let go of the lamp during his journey, making any chances to find it by a fantasy creature wanting the world returned to normal very low as well. Everyone had to adjust and some unsurprisingly did better than others. For others still, the real adventure could begin and their alterations were in the end the best thing that could happen to them. Others had a harsher life, albeit more interesting.