^See, this is why I only post here and don't read other fan-boards. I just watch Supernatural, take it for what it is, and go my merry way. I had no idea that anyone actual cared enough to get upset about female guest stars. There are only two main characters---Dean and Sam--and two regular supporting characters---Bobby and Castiel. Everyone else just comes and goes (mostly going) and I honestly never thought about it one way or another.
The only time I got upset was when they killed off my favorite character---but then dead isn't always "dead" on Supernatural, so I just kept on watching to see how it would play out.