User blog comment:Gh0stCrawler/Skyrim DLC Idea/@comment-4014071-20120814020843/@comment-4057437-20120816082047

While its true the Mages Guild in Cyrodil was disbanded 200 years ago, something would have filled that vacuum by now.

The Fighter's Guild could have a change of heart

An Argonian assassin's guild could try to expand from Blackmarsh.

There are plenty of possibilities.