Zenimax already revealed they are planning on releasing the Thieves Guild, Dark Brotherhood and Justice System in a content patch after launch. With that said, here is an idea for post-launch content down the road. This new NPC guild (Healers Guild), which is made up of healers, priests, and alchemists, will lead up on a series of quests to cure the diseased/poisoned. This guild can be found in the chapel in each major city. Traveling will be very extensive, since you’re required to journey many miles to tend to the sick, collect ingredients for potions, and find books on curing various diseases, etc. In addition to adding many hours of new content, a new Healers Skill Line will be added as well (geared towards curing various afflictions):
Cure Poison
Cure Paralysis
Cure Disease (Ataxia, Bone Break Fever, Brain Rot, Droops, Rattles, Rockjoint, and Witbane)
Cure Vampirism (Sanguinare Vampiris)
Cure Lycanthropy
With the addition of the Healer Guild, the developers would also add numerous diseases to the game, such as; http://elderscrolls.wikia.com/wiki/Diseases_(Skyrim)
Lastly, the Healers Guild is mentioned in the lore but has never been included in an Elder Scrolls game; http://elderscrolls.wikia.com/wiki/Guilds_Act
Thoughts/Opinions?