If there existed a magic wand to make longer addresses work with existing stuff sure, but since there didn't, you have all the exact same problems as ipv6 which

If there existed a magic wand to make longer addresses work with existing stuff sure, but since there didn't, you have all the exact same problems as ipv6 which is already basically the same thing as ipv4 anyway with 128 bit addressing, and some minor tweaks to how the "arp" works. If you can articulate how this magic wand would work in practice we're all ears since you solved a worldwide problem, but I'm betting my salary that you can't.