I think we'll see 600% within that timeframe too provided nothing major happens to the USD and it plods along to the beat of depreciating value as it's done since the inception of the FED. However, if a major currency crisis occurs engulfing the USD and global fiat in the process - you might as well change 10yrs to 10 days, or even 10hrs - and then you wouldn't be able to put a price on gold in $.