The older generation isn't going to be getting their end-user AI agents working either. While the next generation may consume more video content than before, all the kids I know still get frustrated at a video that could have just been text unless it is something they want to enjoy.

The only time voice makes sense is to facilitate real time communication between two humans because they can speak faster than they can type. Conversational approach to use cases often have limits, though that doesn't preclude AI technology from providing those interfaces, so long as they aren't constrained to voice. A chat agent that pops up a calendar UI when scheduling is identified as the goal, for example.