Nah it won't happen since the reason why they are split is to balance out the crafts.
Smithing is for weapons
Armorcraft for heavy armor
Leathercraft for medium armor
Clothcraft for light armor
Carpenter for wood based gear
Alchemy for potions
Culinary for food
Goldsmith for accessories

This is the main grab of each craft and while they all have other items that they do offer if you look at it like this you'll see why smithing and armorcraft were split the way they were. To have it in one class would give them a superior boost over other crafts since they would be able to offer a wider variety of items compared to the other crafts.