Many people are complaining that there is more and more gold in the system and naturally every expansion needs to put out more money as damage-number increases. And while there was a stat-squish, that's actually not so easy with the currency-system, because every change there would
So rather than a gold-squish, why doesn't we get a new Currency above Gold? So even if we go through the usual-routine of 100 gold converts to a new currency, that's quite a reducing of numbers.
So 100 Gold gets converted to 1 Truesilver Coin (the next rare metal in wow)
So if you have 2 million gold, it gets converted to 20.000 Truesilver Coins. To keep the UI simple, after you reach Truesilver, copper disappear from your UI and in the auction house menu. If necessary, this can taken further in future expansions (Arcanite Coin)
This would make a squish unnecessary, since the numbers gets automatically squished with the introduction of a new currency.