Sorry to disappoint you, zaverxi. But I think we gotta keep in mind that all DoH classes have the same actions/buttons. Any additional DoH class won't have any kind of different game play.
This is unlikely DoW/DoM. So we can't say, "Look, DoW/DoM are having more jobs every expac, why not add a DoH?"
There won't be any players that will "main" the new DoH as it's exactly the same game play as all other DoHs...
Everyone is pretty much an omnicrafter now (ever since they made leveling a joke via Ishgard Restoration), so that new DoH will not provide us any new "fun", but just be a slight burden to level (that takes perhaps 1 to 2 days, but still a slight burden).
If this is just for the sake of the name of a "Stonemason" that uses a chisel or a mallet, and with some class-specific new glam that probably no one will use because shared gear is just more convenient, then I don't think it's worth the work of the developers either.