The money squish wasn't a good idea imho. The prices at the trainers, etc. remained the same (f.e. 5k gold for highest rank in flying), what gonna make people looking for profit again and the prices will increase again. Also -and connected to the previous thing- in the AH the prices didn't decrease as much as our money, or didn't decrease at all for uncommon or more rare.
This means that those who had less money will suffer from this more, then those, who piled up both money and valuables and won't feel nothing from this, meanwhile they will continue to push up the prices.
I don't have full idea how could do better next time, but f.e. with the same prices at the trainers people surely will push up the prices faster.