There are so many potentially interesting applications outside of "make a digital ghost of your loved one when they die", which is (in my opinion) the most boring possible use of this technology.

You could digitize a copy of noted scientists or experts in their field and replicate them in schools as teaching aids. You could create a digital duplicate of yourself and talk to it. Trying to make a tough life decision? Generate five digital copies of yourself and have a discussion on what to do. Or boot up a copy of a noted philosopher or therapist. Be a game designer, hire people to upload aspects of their digital avatars, use them as the basis for your NPCs.