Yes, I would agree that immortality would change the social system. Although, I'm not sure that overpopulation would necessarily be a problem, if immortality was generally accompanied by infertility. Reproduction might become a relatively rare and controlled process, accomplished through artificial means.

As far as we know, the heads will regenerate their bodies if not frozen. About all that we can do at this point is speculate.

"I'm going to make a wild inference from Sutton's daughter-is-a-freak comment and suggest that it perhaps means Julia was born AFTER the 500 were injected/infected with this immortality cellular alteration thing, while the Scythe fellow was Constance's biological son from before." - This seems to be the most plausible…

Well, I would agree that they wouldn't have been successful if Hatake hadn't taken him down first.

I think it was made clear in the discussion between Hatake and Sutton that he is opposed to genocide. That may cast doubt on at least some of the theorization, then.

Hatake may have been a former Samurai, or something. He's clearly not just a middle-aged medical researcher.

I am wondering if it can regenerate, without being sewn back on. In the context of the show, of course. ;)

Sanada is why I'm still watching the show.

After watching the pilot, I refuse to watch The Following. I would think that anyone who really knows anything about Poe and his work (and dislikes misrepresentation) would refuse to watch it.