Kyubei is trying to hurry everyone to become mahou shoujo, and even the current ones are like "there's nothing good about being a mahou shoujo". Even the one tried to kill Kyubei to stop more from being made. Makes it seem like there's something deeper behind it, you know?
Waiting for dat next ep though, I feel like they won't just kill off Mami that quick so I mean... We'll see where it goes.
EDIT: Fineti I lol'd