I don't think your analysis of that situation is correct. I think the people looking for the easiest way to get loot (ie. Loot cavers [I'm not saying it's a bad thing]), are going to trade because it's an easy way to get the things they don't have. The people who raid, but don't actually care where they get the loot from will probably trade for the bits they are struggling to get. The hard liners who insist on earning evrything will fall into two categories (both will be mad), 1 those who are tired of seeing people walk around with the gear they want... they will cave in due time and resort to trading. 2, the purists who have been in it for themselves the whole time and realize that if you don't have those elusive exotics to look for there is really no other reason to play after a while.