Prices are geometric nor arithmetic. It's a curve not a line. A drop from $1000 to $10 is just as dramatic as from $10 to $0.1 repeat that logic, then repeat again, infinitely.

The point though is that because a crash MIGHT be dramatic, then the panic will be greater and thus actually cause a greater drop, and that feedback process might have no end. Whereas pressure to buy gold builds (exponentially?) as the speculative to inherent ratio decreases. A good with no inherent value always has an infinitely inflated speculative value/inherent value irrespective of it's price. The value of a dollar is absolutely arbitrary, but is riding on purely psychological momentum since it launched from its gold backing.

For posterity, I note again ad nauseum, that a bitcoin transaction has value and is priced exclusively in bitcoin (fees and inflation tax). If euros had wings, we'd trade all our dollars for flying money. Bitcoins are better.