Gold went from $1900 to $1200 in, what, 6 months. That is a 33% loss. Not exactly totally stable.
That aside, gold is going to have less importance going forward. We are moving more into a digital world. Physical assets are going to have less value than digital ones. We already see that with the largest corporations. Companies like Google and Facebook own relatively little compared to Gm or XOM yet are worth more. Why is that? Because the digital assets they own, are move valuable than plants and raw materials.
Take something like art. The blockchain is showing how something like a painting wont have the value, but rather the key that accesses that place of the blockchain that the painting was registered. Without that key, the painting is going to be worthless.