My brain says NO-NO-NO, but my libido says YES-YES-NO.
I can only imagine that it would feel incredibly violating to know someone else is exposing your body to the world. Unless of course it was ok'd by the original person, but then I'd have to wonder why, say, Scarlett Johansson would be ok with someone else flashing her boobs everywhere and go to so much effort to have her own nude pics censored.
As for the deceased, as sexy as Marilyn Monroe was, I'd just feel wrong getting off to not-her. I don't know if I'd be very pleased if I knew my legacy would be people pretending to be me doing all sorts of stuff with 'my' body.
No way for the kid one.
All in all, I can see a shape-shifiting call-girl being the new most sought-after thing in existence.