Since wig fiber is literally thin strings of colored plastic, I highly doubt you could desaturate it any easier than you could lighten it. You could certainly try adding some gray over it, which might make it shine a little grayer in the light, or just make the blond less bright.
Meetup was AWESOME. Though I think it's silly that I was productive when I wasn't one of the people who actually needed to go to Joann's. We just happened to be there, so I decided to be productive. Granted, buying buttons is much simpler than buying fabric. >>
You can tell I'm really tired when I get more talkative bwahahaha. Oh, and happy Thanksgiving everyone!