I am very hopeful and they sort of stick with how the previous ES games have it, but I kind of hope they limit each player to just specializing in 1 thing. I have a list of my idea, which may or may not be in the game. Keep in mind, this isn't a suggestion to make this a better Elder Scrolls game, but rather a better MMO.
Perhaps we don't have to limit everyone from being able to do just 1 thing, but rather that they choose to specialize in 1 of them. Someone who specializes in the trade would be allowed to craft for a bit cheaper on the materials, and possibly reduce the time required or the chance of failure. Anyone can be a miner, but the actual miner will find more, and be able to use more of the ore to make ingots than those who aren't specialized.
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Miner - The people who can literally mine ore in the mines. They also will be able to mine gems, and possibly collect sand. This profession also can refine the ore they mine into ingots, or refine the sand to make it purer for those who craft glass.
Hunter/Tanner/Skinner - These people are the ones that can skin animal hides. They also have the ability to tan the hides and furs they skin. They can harvest claws and teeth, and possibly ivory.(I feel there needs to be more use out of this profession. I am still looking for ideas on to make Hunter/Skinner/Tanner more appealing... might just mesh it in with others. Anyone can skin a hide... but only Blacksmith, whether armorer or weaponsmith, could tan and prep it for weapons and armor.)
Blacksmith - Armorer - These people can take the ingots and fashion all sorts of armors. If you want Iron, you just need Iron ingots, if you want steel, you need Iron ingots and Coal. If you want leather armor pieces, you need tanned hides. You also need molds for certain pieces. Possibly jewels for shiny looks.
Blacksmith - Weaponsmith - These people of course craft the weapons. They use much of the same ingredients as the Armorer. Their focus is weapons. They also need leather for grips. Possibly jewels for shiny looks too.
Jeweler - Self explanatory. These people take the precious metals that are mined, and gems to make jewelry, like necklaces, rings, and crowns.
Enchanter - Enchanters will enchant crafted or blank items with enchantments. The main source to do enchanting will most likely be gold, and lots of it. Perhaps with large amounts of gold, also use magical beast parts like hearts, frost salts, fire salts... but mostly stuff anyone would pickup just from adventuring.
Herbalist - These people know plants, and can gather them without destroying the plant. I thought a small private garden would be nice, if they ever do housing. Of course it would have to be instanced away from the main areas. Allow them to plant so many plants in their own garden, which they must upkeep if they wish to keep harvesting them. They also can make basic salves and wraps and consumables that help in minor ways.
Alchemist - They will be the ones that can take ingredients from adventuring, like daedric hearts, frost salts, etc... and plant ingredients from herbalists to make potions. These potions will have greater effect than the minor things herbalists can make. They should also be able to make grenades.
I am hopeful something like this comes up, and everyone is limited to 1, because it sure would make for a great in-game economy if there were all these avenues you had. Sure any one person can make alts to do all of them, but that would take a LOT of time. It encourages people to interact and trade with each other, and will allow for a decent way to just earn gold by doing something menial.
I understand there also may be some lore limitations. Especially among Bosmer, and the Green Pact. If anyone has any ideas to add to this, feel free. I am completely open to suggestion. Maybe another profession that I didn't think of.