If the International perception of gold being valuable disappeared overnight (which... yeah, won't happen unless someone discovers legit alchemy magic) the difference between losing 90% of your value or 100% if it had no use outside of the speculation shouldn't be influencing almost anyones decision in what to invest in. All the other parameters (volatility, profitability, etc) are way more important than if you are completely bankrupt or completely fucked if the market implodes.