You had DE materials there from disencanters.
You have soulbinds who give satchels with enchanting mats (Kyrian).
I am not a 100% sure, but I think you could also use excess anima to buy covenant armor pieces and then disenchant them, or atleast you could before they turned them cosmetics.
You can also do the world quests and ZM rares to DE those. I think blue gear has a small chance at giving shards.
You also have a rare up in Bastion which gives you a shard guaranteed on first kill, and each consecutive kill after that (each day) has a chance to give you shards.
Now multiply this with some people running up to 6 alts for the callings chests, which can also give you epic materials on top of the epics from world quests.
EDIT: Just for comparison: I was doing table missions and callings on 6 characters for a while now (I stopped for now) and my enchanter, after maxing my professions, have enough shards to craft around 100 weapon enchants, or enough other mats to craft 300 ring enchants, or 400 armor specific enchants. That is without doing any sort of instanced content on that character too.
That is a given. There is barely any movement on the AH right now and for that small movement there is a lot of competition to go around.
A few days ago you could earn 80(!!!) gold profit from the Heavy Desolate Armor kits at some point, so I crafted around a hundred to sell them on the AH. I had to sit there and try to infrequently upload small amounts of my stock, because there was a constant, 1K stock movement on the AH about it. There were atleast 8 other people doing the same thing as myself.
By the next day the market price dropped by 20 gold within the timespan of a few hours, because people wanted to sell their stock so desperately that they started doing massive undercuts.
I expect the gold income from the AH shift over from base materials more over to work orders instead. The AH merge will also not affect the pet and the crafted gear market, nor will it touch the transmogs.