you dont understand the problem do you? its not the player which is in danger, its the npc's. danger can be found anywhere else in skyrim and this feature will piss people off in no time. no-one wants to baby sit a town everytime they go to store gear or sell items in the shops...
You dont have to baby sit a town to keep it safe, just keep your eyes open. (and you can reload if you want too)
and I
dont want to be babysitted by the game either.
The danger doesnt exist if not in dungeons, and thats not right in a game that its supposed to be an 'open world'
I dont want ghost town, so i will keep my eyes open while in a city to avoid casualties.
by leaving danger only in dungeons you kill the sense of danger and the world becomes static, at least with the atacks we really feel that the vampires are a threat to the non-vampires.
The fact that npc dont respawn and that now they actually have a chance to die its something that really improves the game experience (in my case, but i can undestand why others dont like it)