Personally I think there is still room for a new version of IP. v6 is still only in single digits. If something better came along (that was backwards compatible

Personally I think there is still room for a new version of IP. v6 is still only in single digits. If something better came along (that was backwards compatible!) you could potentially outstrip it. Just because some committee made a bad decision 20+ years ago doesn't mean that the discussion is over. A lot of the people implementing these solutions were children when v6 was designed and they might have new ideas. A 64 bit, backwards compatible version of IP could be a winner. Part of the problem of course is that most people still don't see v4 as needing a replacement because it's still working.