Why should we expect carriers to adopt IPv6+1 any quicker than IPv6? Are there specific elements of IPv6 that are so carrier-unfriendly that correcting them would be worth throwing away all the progress that's been made?
Because we'd be talking about something closer to ipv4+1, something that allowed core equipment to not have to process packets in a different way and maintain completely separate routing tables for granularity of traffic that only matters at the edge.
