To your point, IPv6 has been around 20 years, the whole time we know we're running out of IPv4 addresses and adoption is still around 20%.
However, the high turnover for mobile phones has allowed more aggressive changes to the networking stack. Perhaps this, in addition to IPv6, would make something like SCTP easier to adopt widely?
However, the high turnover for mobile phones has allowed more aggressive changes to the networking stack. Perhaps this, in addition to IPv6, would make something like SCTP easier to adopt widely?