This is an inelegant and divisive plan. The appearance given is that WMF is an authority over local communities and can enable significant changes without consultation.

Fixing Cyberbot III's signatures is flagging up people's watchlists. Considering that all of the bot signatures that may carry the error are over a year old, the desire to tidy up these low level potential errors should be balanced against the disturbance to article watchers who go to check out what has happened. As the Cyberbot III messages are old and no longer essential, if the signature does fail at some point in the future, that is not going to cause users a problem, and any such errors can be fixed by a bot at that time.