Uhm. No. The world goes on everywhere even if the player isn't there. The villagers would have to worry even if the player wasn't there.
No..... It doesn't. There are a few ways to tell this.
Firstly: Dragons start spawning as soon as the player reaches a certain point in the main quest. They can fly into cities such as Whiterun. However you never travel into Whiterun to discover that the town has been depopulated in your absence.
Secondly: If that was the case, my computer would buy a new jacket and spend the rest of its working life sitting in the corner of a completely white room rocking back and forth singing quietly to itself.
Thirdly: If you increase the view distance and download a mod such as Wars in Skyrim, which adds a copious amount of NPCs to the game, you will notice that the most distantly rendered NPCs only start interacting with the world or even attacking each other when the player draws near. Otherwise they just stand where they spawn. Likewise, if you walk through the zone, witness one battle, and then return again 5 seconds later, all of the NPCs spawn which your computer wasn't able to handle the first time around. If your hypothesis was correct these NPCs would be rendered as dead bodies because the battle was fought "behind the scenes"
you mean it will feel slightly more dead, with 90% of the villages depopulated.
Hahahaha XD