RE: Superhero Movies: The Truth About Our Love for Superpowers

The line I'm saying is spoken by different characters throughout the film, by different characters, and each one gives it a particular tone. I think the most intense one is when, near the final third, the villain talks to the father of the family about superheroes and explains that he's going to play at being a superhero with his inventions, and after he gets fed up with that, he'll sell the inventions to everyone, so when everyone is 'super' no one will be 'special' anymore.

The villain had become disillusioned with the attitude of his childhood hero and had developed a sick and vengeful obsession with supers, so making their powers commonplace was part of a great revenge. Eliminating what is considered special, not by destroying it, but by vulgarizing it, making it so commonplace that it would lose its sense of rarity.