I far as fishing goes, I don't know of anyone that was buying any tackle or lures including me. That is probably one of the reasons SE is removing them, plus remember SE is reducing the inventory space from 200 to 100 slot for each players. By removing arrows, lures and items such as those, they are helping players be able to control their inventory.
At the same time gathering is going to play a even bigger role since they are the only ones to provide shard, crystals and clusters to crafters, just like now with the catalyst for materia. The main changes in items will be to reduce the need of those items in the field.