While it was a good plot device for ending the series I think the idea of hundreds of slayers/potentials is a complete disaster for an ongoing story. It devalues Buffy and the Scoobies, not to mention every man on the planet.
Somehow, Wheedon would have had to get rid of them, if there had been a season 8. Or perhaps not...he's on record as saying the concept of female empowerment is more important to him than logic/story.
It is, in my view, the worst idea to come out of the Buffyverse.
Even the brilliant Wheedon can have a duff idea once in a while
