To fix this problem, players should give RS gold back to their game. This would eliminate the need for circulating coins. While I am not an expert on the Araxxor matter, I believe that incentives are a good idea to encourage players to use their money in a way that doesn't allow it to go to another player.
As an inactive participant I don't have the necessary knowledge to recommend any sensible methods. There are still ways to get rid off money that have been in circulation for a long time, such as the shops, sawmills and other. They cheap RuneScape gold controlled inflation pretty well between 2001 and 2009.