Onmur
Archangel of Nutella.
Well, we can't exactly go city by city and tell the megucas that they have to go back to fighting Witches after we handed them a Clear Seed - the ticket to not having to fight Witches anymore.That's...an incredibly irresponsible way of looking at things. For starters, we don't know if we'll ever figure out a way to stop all Witches everywhere, let alone when.
And if it isn't safe enough to hunt Witches as part of large, well-practiced groups, then how would you deal with them?
Also, the vast majority of MGs straight up not fighting Witches anymore would lead to a huge increase in civilian deaths. The Witch population would multiply because familiars also grow unchecked. And more super-Witches would form because normal Witches aren't hunted down before they have the chance to combine into super-Witches.
It sucks, but magical girls are the only ones who can deal with Witches and familiars. Which means that they must, because otherwise the problem will grow out of control and become far more dangerous to deal with when (not if) it becomes too much of a problem for them to ignore.
Some of them will keep fighting, specially new contracts who wish specifically thinking about protecting the people from Witches. Other will straight up refuse, and there's nothing we can do about it besides asking nicely.
The meguca who agree to keep fighting Witches, those should be arranged into large, well organized and well supported hunting parties so they can hunt Witches with minimum risk. But that's only a stopgap measure. After all, we don't want the future of the meguca world to be the same as it is right now but with less witchouts. We want meguca to be able to live normal lives, and many meguca simply won't have the strenght or disposition to fight.
In time, we should have untold-of-large amounts of meguca working together. We can figure out large scale magical solutions. Give it time.