While I'm happy with the news, I don't think it'll make a lot of difference in the long run - the money people are making in China over selling virtual goods is just too good to pass up I think.
Sitting behind a computer all day farming gold sure is a helluvalot easier than actually farming land, and pays several times better as well, if I understood right.
In addition, I don't think the law is aimed at gold-farming at all, but instead ruling out the QQ-coins, so chances are it isn't actually enforced for "export products" like (wow-)gold.
Even if it will be enforced, several options to circumvent the law already spring to mind - how about a foreign-based "credit card" company (Korea maybe?), that allows you to charge your card with wow-gold, then gives you a balance in real currency?