Gold-backed money, which was practiced for most of the modern age since the early 1600s, is just another method for the elites to receive free benefits and destabilize the economy.
Paper money becomes IOUs for gold, and other assets are based on the paper. But the elites will use state power to support credibility in the IOUs and issue too many IOUs (or derived assets.) All global dominant empires (the top of the world system in their times) eventually saw their system crash and their countries decline -- including 16th century Spain, 17th century Netherlands, and 19th century Britain.
Financial inflation will be slower under this system, and this may be a benefit for the public, but the system is not fundamentally different from today's.
The elites and the media will of course never say this beforehand, but during the 'fiat' era they have always kept gold as a last resort (as Alan Greenspan recently asked, why do central banks hold gold?) If their system proves unsustainable, they will go back to gold-backed money in some form. (In an age of sophisticated financial engineering, it probably won't be the simple gold standards of the past, but it won't be materially different. See India's recent gold 'monetization' scheme for hints.) This is a good reason to hold gold.