What does this change? Not much, surprisingly. Because gold has been available for dollars since World of Warcraft was released. Only you had to get it on the black market. And that market was huge. Blizzard repeatedly banned hundreds of thousands of gold SELLERS. Now obviously a gold seller needs several customers to survive, so millions of people have bought WoW gold over the years. It is just that nobody ever wanted to admit it.
So the major effect of this "kitten economy" might be something that Blizzard has been unable to achieve for 7 years: Killing the third-party gold trade. Why would you want to buy gold from some website where you risk getting scammed and have no means to get your money back if the gold isn't delivered, if you can buy the gold via completely legit and official channels?