This top-end difficulty was missing entirely from Legion’s first raid, Emerald Nightmare, which was cleared by top guilds in around 11 hours. Meanwhile the first guild to clear Uldir’s hardest difficulty, Mythic, spent somewhere around 70 hours attempting to kill the raid’s eight bosses. Even after all that time, the guild, Method, still had members say they loved the raid, and that it was one of their favorite in recent memory.
Zandalari troll (8.1.5) - "The Zandalari are a proud people whose origins date back to the early days of Azeroth's history. Their fierce warriors ride dinosaurs into battle, and they possess one of the most formidable naval fleets in the known world. But enemy attacks on their borders—as well as unrest within the king's council—have threatened the kingdom's foundations. By returning stability to Zandalar, the heroes of the Horde can gain a powerful new ally.."
Inscription and darkmoon decks remain highly profitable still as long as you approach it with the right mindset and understand that it is a commodity market and the goal is not necessary to sell crafted decks. For me, it's an exercise in managing purchasing Linen & Herbs below market, balancing opportunity cost of converting linen to expulsom, and mass purchasing underpriced individual cards and relisting them at a profit but under the crafting cost so that they move. That's the primary goal, and you naturally complete decks that you sell but you don't go out of your way for.
I think what you're actually talking about when you say "niche" is the barrier to entry for new players. It sounds like you're worried that new players can pick up crafting professions and compete easier than before. Again, I'd say that the alpha build info in the OP looks pretty much the same as the current expansion. The true barrier to entry isn't the ability to level the profession quickly, it's actually recipe ranks. Some really good examples of this in the current expansion are rank 3 bracers, rank 3 flasks, and rank 3 felwort. It takes a certain level of investment to get those ranks, and the goblin activities related to those crafts simply aren't profitable/competitive without rank 3.
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There's a few profession crafted pets in BfA on the horizon - Battle for Azeroth Tailoring is getting a Hot Air Balloon style pet, and BfA Alchemy looks to be getting a brand new Transmute Meat to Pet. There are some mount buff consumables from both BfA Leatherworking in the form of a mount barding, and Blacksmithing in Battle for Azeroth will be able to craft Stirrups and Hoofplates to increase mount speed and allow you to interact with things while mounted.