I made a post, about this, on the PVE NPC guilds thread but it seems hardly anyone looks there so I'll make a post like that here, to see what happens.
They've stated that they are considering a Dark Brotherhood and Thieves Guild.
When and if they do this they could make quest lines and also make these guilds a location where you can pick up randomly generated, hit and Thieving contracts. These contracts could be scaled to difficultly based on your level.
They could also make the Mage, Fighters, and Undaunted guilds have this ability.
The ability for rapid new content, opens up a great deal here.
They could write mini stories pretty much the way add ons have been done in the previous Elder Scrolls games by players.
They can also open up access to different countries that were in the previous games, via travel by ship or some sort of guild hall teleport.
And by different countries, I mean new countries that are not in the game now.
These could be countries that existed in previous Elder Scrolls games and even ones you read about in Lore but have never been created for actual play, with the wonderful graphics that we have today.
If you go way back, to the beginning Elder Scrolls games, the possibilities are right there.
The Original guys that came up with the Elder Scrolls did some fantastic stuff for those times.
They had the first randomly created dungeons, with 360 degree rotatable maps of the dungeon interior. These dungeons scaled from small to massive. So that 360 degree rotatable map, was truly great. These guys were doing stuff for games that was on par with 3D rotatable graphics used in Engineering.
You were able to travel, to all the different kingdoms to deal with the myriad problems that revolved around the Royalty, and common folk of these kingdoms.
And there are all these different Daedric kingdoms besides Coldharbor to expand and explore.
And while they're doing this they can bring in the stealth abilities that are missing so when you're doing these contracts, you can use stealth to get yourself set for the attack, the way you have been able to do it, for around a decade, in the previous Elder Scrolls games.
Having played The Elder Scrolls games, from the very the first title, I could go on for quite awhile about all this, but what does everyone else have to say?