Yeah...it would be pretty cool to be able to talk to a 3D character face-to-face, especially if it could be changed to a different character should the user desire.
Of course, some of us would just be really content if we could converse with our computer similar to was done with the AI, HER or HAL9000 or iRobot's Sonny or a number of intelligent entities or artificial life forms.
Imagine walking into your room and your computer would detect your presence, recognize your face and call you by name, without you having to sit down at your desk and run a specific program, etc.
You could casually ask it questions or have an interactive conversation or ask it to run a program or when an appointment was or to set a reminder for a future event and so on.
I think this future is a lot closer than we think. It's practically at our doors.
Just wait...