Im thinking the AI voiced NPC would probably take years to be used in the game industry but text-only based AI conversations can probably already be implemented in-game , not sure why we haven't seen those in games yet. We already have tons of chatbots.
Anyway I'm excited for these stuff even if its not voiced to be coming soon, It's gonna provide 'endless' non repetitive content for a lot of open world RPGs.
I bet if SBS haven't already they would eventually implement some kind of AI for their NPC speech (text-only) during those 10 years of the story... after all they want npcs to be indistinguishable from players. 10 years is a long time in terms of technological innovations specially considering the rate of innovations increase as well. Although I'm assuming that the developers would improve the game continually after release for that 10 year period, which (apart from research based add ons) may not be the case.