Please don't make crafting another daily chore like most things new in game these days. Crafting for many of us is something you do to help others, relax or just take a break from the daily grind of dailies, missions, delvings, whatever it is that you have us do in order to be able to play the game. If I spend the time to level my crafting and level my guild reputation I really don't want to have to start over because I skipped doing anything crafting related for a week or two and I lost status of some sort with the guild. There are too many dailies in game now and developing a system where we have to log in and do our daily crafting would probably kill the idea of crafting for many people. Crafting is one of the few things left in game that does not require someone to complete repetitive dailies. Please consider that something fun needs to be in game for the player base. Another item on the to do list when logging in makes all of this more like a job than a game. If you decide to force us to engage in crafting by making basic weapon or gear parts needed to participate in content a mandatory part of the system, people will stop engaging in the game.
I would also request that you allow us to use the crafting ingredient packs from our crates at the higher tiers. There is nothing wrong with allowing people to use the ingredient packs as a substitute for the basic ingredients and you can still require the special shards and other items with them. There is very little difference in using a stack of ore/hides vs substituting a stack of ingredient packs. Account bound items and just you being flexible enough to allow us choices.
Please make special ingredients and materials available to the general population. The special materials required at level 115 and 120 that only dropped in higher level raids made crafting irrelevant during those times unless you happened to be lucky and get the special drop.
Please don't make us start over and require people to relevel crafting and guild reputation. Please consider allowing everyone to purchase additional crafting lines and if we want "one crafter to rule them all" it is a win for everyone.
Whatever you implement, and I honestly suspect you already have a plan in place, please reconsider your ideas and remember that this is a game. Most of us play the game for fun and relaxation. Daily chores are not fun for everyone. There will be a point where daily chores overload most of the player base.
And......please implement a complete system rather than part of a system that will be fixed someday at a date to be determined.