They're not going to fact check, they're simply going to think "huh, could be AI" and that will change the way we absorb and process information. It already has. And when we really need to know something and can't afford to be wrong, we'll seek out high trust sources. Just like we do now, but more so.
And of course some large cross section of people will continue to be duped idiots.
Most people don't even know what AI is. I've had to educate my parents that the technology to not only clone my voice, but my face.. is in existence. Pair that with number spoofing, and you have a recipe for disaster to scam people.
And of course some large cross section of people will continue to be duped idiots.