If the US Dollar would revert to projected half-life curve, then that equates to a 75% depreciation from now. If my math is ok, That should bring gold a little north of 6k (6220$) an onze.  There was a similar fall in USD value versus gold in 2006.

Now… will US Dollar resume it’s half-life curve, or remain suspended in mid-air at these level?.. Or even go back up? Is that possible?

http://pricedingold.com/half-life-of-the-us-dollar/