They should make a "recording mode" that you can turn on. When you speak to an NPC, you can turn on "record mode" and speak out the npc's words. Then it will save these voice files and you can share it with the community.
Yes, Larian should spend a bunch of time and effort to let people add and integrate very poor-quality voice acting into their game. That sure seems worthwhile.
There are many mods for Skyrim that have custom voiced npc's by the fans. I'd rather have them do the voice acting than have to read all that frickin text.
Imagine being able to immediately record voice files for that "Shell" on the seashore, then being able to share that voice pack with everyone. Voice Acting problem solved.