I'm sitting in my sister's house in Waukegan Illinois right now. A mere fourty five miles from where they're currently holding the International Congress on Anti-Aging Medicine and I, of course, don't have the money to attend. Sitting here thinking of it however, I realize that I have a bit of a problem with it. By the age of twelve, I had done enough irreversable damage to my body that doctors have been known to pity me for the pain they expect me to be experiencing for the rest of my life.
I don't want this body forever. If it were possible, I'd pick up a new one tomorrow. It would make life much easier. I certainly don't want to die, I would prefer not to until the universe dies with me, but I don't think I can handle more than a century in the battered vehicle my consciousness currently inhabits, which brings us to consciousness uploading.
Who's to say that once we accomplish this, it'll still be the same person rather than a facsimile of the original. I don't think I'd be comfortable with any guarantee on that unless someone devised some sort of interface which kept the conciousness active while the brain died off maintaining one continuous unit throughout. All of the uploading ideas you hear involve creating that copy which may not be me.
So what comes of this? How can you know that the person being created is still you? Even if it is, could you still consider yourself human? Perhaps these questions will be answered when theory becomes reality.