Jeff had always had an abdl/infantalism fetish; with this machine, he could now bring it into real life.
He decided to change the world into one of adult babies and mommies. Adult babies' capabilities would range anywhere from near-newborn to a toddler almost ready for preschool, but even the most capable would always wear diapers, have a poor command of language, little control over their emotions, and a great ignorance about the world, always needing to be cared for by someone else. The mommies would be able to take care of every single need of their babies, from feeding and cleaning to playing and emotional care. Nobody would have any jobs or any need to go to school. Instead, adult babies would spend all of their time playing in infantile joy while their mommies would look on them with a smile, ready to help them at a moment's notice.