User blog comment:Mythicdusk/Possible Skyrim DLC?/@comment-3157507-20120123205526

great idea, there is only one real problem: Skyrim's game engine has problems with large scale combat, something reviewers, gamers, and the developers have talked about. The engine is very smooth and great, but starts to have lagging issues, physics issues, and glitches when larges amounts of A.I start fighting, noticeable during some of the Civil War quests, when the battles for cities or even forts get kinda clippy and confusing. So if the game has some problems handling that, DLC with large scale combat might not be a good choice for Bethesda to make, seeing as it is near impossible to upgrade the game engine so it can handle large scale battles easier. That being said, if they managed to find a way for this to work, I'd definitely buy this DLC :)