Yeah, but that precious metal bubble was because gold was partly marching in formulaic lockstep with silver when the Hunt brothers were trying to corner the futures market. The bubble burst shortly after the exchange raised the margin requirement, forcing the Hunts to quickly liquidate at unfavorable prices to try to cover their margin call.
Also, gold was partially linked with oil, and when the Saudis said "Fuck you, OPEC cheaters!" and opened the spigot on production in the mid 1980s, gold tumbled along with oil.
So, I'm not sure what is the modern equivalent co-factor regarding bitcoin. And China doesn't seem to really yet be doing much to shut down capital flight. And me thinks they don't mind the Yuan being a bit weak given risng wages there and the crackdown on corruption dampening profits.