"Security will need to be addressed accordingly." You say that as if it were a small thing. Indeed, as if it were a thing with a known solution. In reality this "security" issue of consumer pcs directly on the internet is a bigger problem than v4 address exhaustion. Today it is perhaps a multi-billion dollar a year problem due to worms, viruses, botnets, ddos, etc. Intentionally making the problem worse is a recipe for catastrophe.