The relative gold income will all be leveled out when they announce the game time for gold conversion.
For example, let's say it costs 50,000 gold for one month, would you pay that? How about 500,000 for one month?
Rather than nerf the gold income I think they will use the game time to level the field and remove 80% of the gold from the economy.
Everyone I talk to that has 100,000g + is saving it to pay for game time.. I can see that stockpile dwindling VERY fast, depending on this price.
That is why I don't think Treasure Hunter will be nerfed and why I think it was added in the first place.
Obviously Blizz is thinking ahead
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see my reply above, I dont think people will spend money on AH when you can buy game time