It sucks at being compatible with ipv4. The "billion dollar mistake" :-)
It also sucks at having software/hardware stacks nearly as well debugged as those for ipv4, which means running ipv6 at all is a security risk.
Nobody would switch for sundry technical advantages. The main driver for conversion is that ipv4 addresses are scarce. As soon as "we" seriously "move to ipv6", however, the scarcity driven pressure to convert is relieved. We're bound to reach an equilibrium that will include ipv4 for a long time, possibly forever.
It also sucks at having software/hardware stacks nearly as well debugged as those for ipv4, which means running ipv6 at all is a security risk.
Nobody would switch for sundry technical advantages. The main driver for conversion is that ipv4 addresses are scarce. As soon as "we" seriously "move to ipv6", however, the scarcity driven pressure to convert is relieved. We're bound to reach an equilibrium that will include ipv4 for a long time, possibly forever.