filling in background, NPC voices, and things like that, which is unfortunate because those voices were all human beings at one point

Do i want AI to replace human voice actors? Of course not.

But there's no universe where NPCs were ever going to have more than 3 voiced lines repeating over and over about an arrow to the knee or something.

AI would give developers almost infinite variety of inane NPC chatter to make the world more realistic. Thats probably where i would draw the line at using AI. Filling in little world details that nobody would otherwise have time/money to fill in

Or in other words, AI should add something to a game, not give the same amount of content using fewer human minds and hands

Voice AI isn't going to replace all voice actors, and it won't clone many specific people. Those are boring uses.

Voice AI is going to let a voice actor sound like anyone or anything... including people who do not exist. Because remember, these are fictional characters. Nobody plays Geralt, onscreen, in the Witcher games. Or if you like: Geralt is roughly modeled on some guy's appearance, and acted out by a multitude of dudes covered in ping-pong balls. He's a Geralt gestalt.

And he could be even less, if artists modeled and animated him without any "performance capture." Like how nobody plays a cartoon character, onscreen.

Voice AI allows artists to invent audio the same way they can invent video. There might be more artists involved. Each of them churning out a whole library of voiced text for no-name NPCs. Honestly that'd be a pretty great way to recognize a dev team: make each of them a background nobody inside the world they've created, with any ridiculous details they want to throw in.

There will be no need to schedule a recording booth and approve every line months in advance. They can half-ass a take into their headset mic, tweak the machine's output vaguely resembling their voice, and call it good. If the writers ever want to change something later on... they don't need that exact person, in order to redo the lines. The differences might be noticeable. But probably less so than any two people doing Donald Duck.