I think that Prue would have evolved, in terms of power and family-life, but would still be unmarried and childless. That's just the way the character was written . . . but I get goosebumps hearing you guys talk about this sort of thing. It's like I'm thinking "These ideas would be great for the show" and I keep imagining what the characters/people would be like. But it's not happening, of course
I think Shannen did make a wise decision leaving the show, though. Can you imagine what she would say if handed a script that was content wise, similar to the stuff being handed out in the 8th season? I'm happy she left at the top, unlike some who stay around longer than they should. Better to end at the best then to struggle trying to keep up to the same level of fantastic-ness. I like it when people leave a show like that; it shows how good they are at what they do, and that they're open to new shows that could be coming their way.