So yeah if I choose to kill off the Dark Brotherhood is there any unintended side effects? I did a quick playthrough of the Dark Brotherhood and I know that by killing them I miss out on Shadowmere as well as some followers but are there any other side effects like not being able to access word walls due to the fact that I need to do a DB mission to access the area that they are in? Or perhaps unrelated quests that somehow get screwed up by killing the DB?

Please do not call others on the forums "jerkwads."

Spoilers also belong in the spoiler forum, not the general forum with http://www.gamesas.com/topic/1149624-do-not-post-spoilers-in-this-board/ pinned to the very top.