Oblivion = 14 voice actors
Skyrim = 70 voice actors
While I didn't post the actor numbers I'm well aware their around the 70+ range.
What I ment on my previous post was that -Despite- the total dialogue lines in the game being very close to that of New Vegas which fails to awe me Skyrim gains from that larger VO pool than BGS's FO3 and Obsi's New Vegas.
And speculated there could be more NPCs than Oblivion or Morrowind. More than Fallout 3/New Vegas wouldn't be surprising counting the nature of the franchise.
Though the extra populating NPCs have been shown to be simplistic inspite of FO 3/NV going a generic NPC population route.
That's only past TES games though. Skyrim could be a different story.