I was going to argue with you, but this actually would work - BTC is so volatile at least partly right now because it is valued relative to currencies that are being constantly devalued, but if a private business or organization were to essentially place an open order for gold @ 3BTC/g that would quickly stabilize the price.
Pegs to gold don't work if you're expanding the currency (dollars) at a much faster rate than the supply of gold expands (2ish% a year I believe), but that's not a problem Bitcoin has given its transparency and distributed nature of generation....
Put together a business plan and we'll have you on BitTalk to do an interview segment about your idea