If we ever get a Global Auction House, I think the Guild Traders could still have a lore-friendly immersive-experience place in the game world.
Depending on what their stall looks like, they could be assigned one search subcategory, such as Soul Gems or the various types of meats from Provisioning ingredients.
Then, if you needed, say, meat for doing Provisioning, you'd go to a stall that looked like it sells meat. When you interact with the trader, it pulls up ONLY listings of Provisioning ingredients AND of those, only those that are a type of meat. Along with player sale postings would be NPC sale postings of unlimited quantities of various types of meat at dev-fixed prices (sort of like what we already have now with the Grocer NPC).
Some stalls and subcategories would be trickier to assign, and might require a change to the Guild Trader store name, but the above is the general idea.
Edited by Dusk_Coven on 11 October 2019 05:29