Given the current infrastructure, gold will be severely inflated. There is no sink at all because Bliz overestimated the difficulty of inferno and/or underestimated the 'broken' builds that were viable in inferno. The gold sink here should ultimately be repair costs, but in its current form, they are too low. Repair costs should represent a risk/reward factor. If a player decides to plough through inferno, they should not be able to do it recklessly. Every run through of inferno, in its current form, allows a player to be positive in gold. Ideally however, a player should break even most times, lose gold sometimes (due to dying and repair costs), or sometimes (rarely) when they are lucky, they find a nice item which puts them well in the positive.

The AH provides no balance and the RMAH will not resolve the inflation issues. It would allow time limited players to get rich by purchasing large amounts of gold, whilst those with time can easily accrue the gold again by doing a few runs.