Hmm. I suspect, after thinging about it, that it'd make things worse for Earth.
OTOH, it took a lot for Sayaka to turn. Requiring that she turned down a lot of offered help.
I'm not sure how the population dynamics works out. You also need multiple witches to support even one magical girl, which implies that falling is common. Conversely, neither Kyoko not Mami, both of whom are portrayed as experienced, knew where witches came from. The Magical Girls are usually in competition and solitary, but they do
know about each other (Kyoko came to town after hearing about Mami's
death). At a guess, Kyubey is the guy who spreads news about dead or "dead" magical girls - and he, naturally, leaves out things he doesn't want his sheep to know.
OTOH, it took a lot for Sayaka to turn. Requiring that she turned down a lot of offered help.
I'm not sure how the population dynamics works out. You also need multiple witches to support even one magical girl, which implies that falling is common. Conversely, neither Kyoko not Mami, both of whom are portrayed as experienced, knew where witches came from. The Magical Girls are usually in competition and solitary, but they do
know about each other (Kyoko came to town after hearing about Mami's
death). At a guess, Kyubey is the guy who spreads news about dead or "dead" magical girls - and he, naturally, leaves out things he doesn't want his sheep to know.