Looks like Blizzard is taking action to prevent instance farming. The only issue is going to be is it the right action? Will it only hurt gold farmers? Or will it hurt regular players as well. Time will tell.

Instance Limit

During this Tuesday’s weekly maintenance, we will be implementing code into the game that will limit the amount of unique instances a player can enter. This new code should relieve the realm wide instance instability issues for legitimate players that were caused by players trying to exploit the instances.

Update: Please note that if this issue affects realms over the weekend, we will take advantage of the downtime caused and apply the fix early.

The complete forum thread can be found here.