Sadly the same problems will exist in TBC unless changes are made.
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Herbs and ore spawns are notoriously competitive in TBC. Packing what used to be 15 different realms into 3+ layers plus the bot pandemic will make gathering horrible. Just as bad will be the areas where you farm motes like mana and fire. There are easy fixes but Blizzard is not paying any attention.
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Mages selling runs for xp in dungeons (a number of whom are making gold for selling) are the biggest sources of gold for gold sellers.
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GDKP would solve the problem for some raiders who prefer not to buy gold. But it transfers the gold buying to the players who will buy gear through GDKP runs. It just changes which population is going to risk gold buying.