These bandit organizations could serve as mercenaries for all sorts of nefarious activities. A few random ideas:
1. The Thieves guild could utilize various bandit groups for raids on farms or caravans, much the way the comanches and comancheros cooperated with each other in Texas before and during the American Civil War.
2. Competing jarls could employ bandits to infiltrate other holds and mount guerilla attacks in campaigns of harassment.
3. The stormcloaks, imperials and thalmor could all use bandits to their advantage.
4. Necromancers and other menacing characters could employ bandit groups to further their own ends, up to and including the takeover of holds.
5. A particularly charismatic and powerful bandit might try to organize his own underworld organization, either with or without the cooperation of the Dark brohood, TG, Maven BlackBriar, one of the Jarls, or even outside forces such as the imperials, thalmor, dunmer, morag tong, and even akaviri. This could be a POWERFUL DLC and series of questlines.
6. What if a group of bandits actually managed to make contact with the Forsworn and agree to supply them with needed materials - weapons, armor, medicines, food, etc - in exchange for support in bandit raids? Or, perhaps, the Forsworn would serve as Comanches to the bandits role as Comancheros.
7. Even better: what if some very unusual group of bandits managed to establish contacts with........THE FALMER? All sorts of mischief could be organized around that.
8. How about joining a bandit raid, perhaps led by a powerful bandit chieftain that was either a warrior or mage, into a dwemer ruin? New areas could be excavated in existing ruins to support this adventure. Perhaps this bandit group is being sponsored by someone - the Thalmor, some dangerous mage, or another sinister force.
Anyone else have thoughts or comments along these lines?
Bandit DLC's would be relatively 'cheap' to develop as well - there's no need for new areas or dungeons to be built up, just scenarios that need to be created with NPC's and existing landmarks.
Anyway: comments are welcome and encouraged.