Now thats where your wrong if you downloaded the Dark Brotherhood house for Oblivion they give you a shrine of Sithis in your basemant that gave you sneek bonuses and spoke to you not to mention the night mother lives in the void as in her existance conferms his and if you do their quest and somon their DB Ghost he comes from the void and talks(alot) about serving Sithis...so basically he exists and 2ndly how could you destroy the DB there are quest charactors and their strongholds have passworded doors so the only way in is to join. so you cant really kill all of them.
Oh and just because the other Continents are in turmoil it doesnt mean that Bethesda could't revive them if they wanted to.
Sithis? I think he is real. Not in the mortal sense of the word. He exists as the aspect of Non-Existence.
As for destroying the Dark Brotherhood, you never tried to kill Astrid after doing "Innonce Lost". If you do that, you get the password, and get to kill all of the DB. Pretty minor thing. I don't see why we are not given the option with other factions. When I make a Paldadin out of boredom, why can't I kill all these blasted thieves!
As for DB DLC? Much as I love the Dark Brotherhood, I don't think it's a good idea to force factions down people's throats. Best to avoid base factions with DLC, unless you expand all of them.
Oh yes, and my lists.
No multiplayer
Area's similar to Orcish strongholds, but ONLY if they are lore friendly. If it's just a copy and paste of Oricsh strongholds, but filled with (Insert Race here), no thank you. And please, try and make it equal for all the races. I know everybody wants more Khajiits, and Nords and Dunmer, but what about us Imperials, Argonians, and Atlmer?