... I like the idea of a group of Slayers being called a 'mall,' it's silly. Band is probably the best though.
Depending on how Willow's spell works out it might be that all potentials get called as soon as possible, but also keep in mind that Slayers rarely get called younger than, what, 14 or so? This means that so long as whatever makes a girl a Potential doesn't get axed there should be a bunch of Slayers on every planet with at minimum half a billion people, and quite likely there's one for every million or so people at minimum.
Of course, if none of that is true you are likely to get something quite like the Council, quietly shipping Slayers around regardless of any possible official interference in the matter.
Depending on how Willow's spell works out it might be that all potentials get called as soon as possible, but also keep in mind that Slayers rarely get called younger than, what, 14 or so? This means that so long as whatever makes a girl a Potential doesn't get axed there should be a bunch of Slayers on every planet with at minimum half a billion people, and quite likely there's one for every million or so people at minimum.
Of course, if none of that is true you are likely to get something quite like the Council, quietly shipping Slayers around regardless of any possible official interference in the matter.