Bethesda would be smart to recognize that creating a larger world with endless possibilities is the perfect recipe. Maybe the initial data for maps could be enormous for ES 6, and one would actually be able to purchase quest expansions. Essentially, the map would be full of side quests and extras galore, however, to advance the story lines, you could download whichever quests(quest packages) you'd like..

http://www.gamesas.com/index.php?/topic/1242906-official-beyond-skyrim-tes-vi-3/