(uh-oh)
Err...I'm not sure if you've read draft-thain-ipv8 (calling it "IPv8" is dismissive of PIP, which IANA assigned "IPv8" to in 1994), but I would maintain that it suffers from second-system effect more than IPv6 does.
Network access control as part of a Layer 3 protocol? Centralized control servers? Completely upending the global BGP model in ways that wouldn't work for many network operators?