It would be amusing if a moderately breaking change to IPv4 is what finally causes all the old equipment to be finally dumpstered and IPv6 to reign supreme.
Indeed, that would be amusing. But I'm a big fan of getting as much life as possible out of hardware and seeing a whole pile of things unnecessarily dumped is a big ecological impact and that needs to be weighed against the advantages. And it will be hard to judge the impact without actually doing it.