It will easily drop below that, they're just saying that, because that is what they hope doesn't happen =). 1.0.3 is going to make gold worthless, and the RMAH will eventually have 1300 dps items on it for $20, once everyone gets stupid geared.
Because the min price on the RMAH is .25 for 100k gold.
That doesn't mean that people can dump hundreds of thousands of gold on the AH, and it will sell.
The future is in the items, though by the time they nerf inferno and raise the droprate of rares, who knows if there's gonna be much of a market for them.
people think $2.5 is low as it goes because rmah that is the minimum u can charge.... so everyone and their mother will flood ah with cheapest gold.... after all who will buy for any higher??? theres no reason
so now the question is.. what purpose do stores serve? when u can buy it LEGIT for 2.5 dollars? so either the chinese price is 2 - 2.5 because they want to make a profit or as autocmaticcoding said it will freefall to extremely cheap... gold will be worthless if stockpiled for too long, need to focus MF gear for farming high items