[lgunsch]

If IPv6 was going to be successful, it would have been successful years ago. It seems, people are just more comfortable with layers of NAT than native IPv6 everywhere. I'd guess that it should have been more backwards compatible. Similar to UTF-8 and ASCII.

[BenjiWiebe]

My Verizon connection has a CGNAT IPv4 and a publicly routable IPv6 address. It's at least partly a success, if you're using a cell phone on Verizon in the US.