Gold also has intrinsic utility to industry. The same cannot be said for Bitcoin.
I think you'd see more traditional bartering than money being introduced again in its earliest stages.
Jewelry demand wouldn't help, either. If the price of gold went to 0, how much would be used in jewelry? Sure, it's pretty, but being expensive is part of the point.
Gold is directly useful for a huge range of things and the use in industry provides a very real price floor.