Dude, a decade ago the central banks were falling over themselves to sell gold in the 300s. Gordon Brown famously smashed out most of the BoE's gold at the ding-dong low (and at the time he was hailed as a hero).
Now they're all buying it back $1500 higher.
Yeah, I reckon the central banks could be wrong at 1800, just like they were wrong at 300. I wouldn't be putting my hard-earned in Trade Like A Central Bank Capital Management LLC, at least.