One the surface, it's a simple, understandable demo for the masses. While at the same time, it hints at deeper commercial usage.
Disney has been using digital likeness to maintain characters who's actors/actresses have died. Princess Leia is the most prominent example. Arguably, there is significant realistic value in being able to generate a human-like character that doesn't have to be recast. That character can be any age, at any time, and look exactly like the actor/actress.
For actors/actresses, I suspect many of them will start licensing their image/likeness as they look to wind down their careers. It gives them on-going income with very little effort.