ATM CryptoKingdom gold may make more sense than actual gold. VR worlds are on the rise as the physical world can't hide its costs in blood, sweat and tears. Some woman dangles a diamond in front of me and all I see is a CIA propped warlord, death squads and Nicholas Cage asking, "How do we arm the other 11?"
Popular game currencies have threatened the State enough that
overtly totalitarian States had to outlaw them:
http://arstechnica.com/gaming/2009/06/china-outlaws-use-of-virtual-currency-for-real-world-items/And
insidiously totalitarian States in the West have effectively outlawed them by forcing anyone who exchanges fiat for them to be registered money services businesses under the AML clauses in the asinine oxymoronically named Patriot Act.
So yes I agree virtual game currencies have shown promise but so far they lacked resiliency against the State (anonymity, decentralized exchanges, decentralized consensus that can't become centralized, decentralized scaling, etc).