From what they're saying, that'll be like immortality in another plane of existence. That's a clunky concept of immortality. I'd be better off with them coming up with some kind of design where a good portion of my body becomes mechanized or something (or they do some kind of biological treatment or something), which in my opinion is a bit more practical than the shit they're going for anyway. At the least I doubt it'll be quite that much more difficult.