Gold's value is only based on the value we place on it too.
I guess I didn't think my idea through completely, we'd need some physical thing to put limits on the money that can be created etc. Or we could say there's like an extra million dollars (or whatever number) available for each person born.

I didn't think this through a lot because I'm really just hoping we won't need money in the near future. Resource based economy is the way to go.