I think that it might be possible for an AI to create an imitation of a person based upon what is known about them but I really don't think that there will ever be a clone of one's memories or experiences. At best it will be a pretty good imitation though I don't think that it would actually be considered conscious. That's not nearly the same thing as eternal life. I guess maybe more like what you get at the Spirit Tree in Avatar or the Holodeck in Star Trek