the problem is when you hint at such a feature, or even tease it, the cause will have an effect, and this effect is people are now hording gold and tokens and they aren't spending real currency in the BNET store anticipating they will be able to use gold/token as a currency. Its like a snowball going down a hill, its already rolling, people are already preparing for it. There is no going back and no putting the genie back in the bottle.
Speaking for myself I won't be making any purchases with real currency because why should I? If I buy a mount today how would I feel if the next day everyone else is buying it free with the gold they have made in game?