Interesting question. Consider someone arriving on island. They will have to register firearms they bring within 5 days. It's possible that person will have to give their temporary "place of sojourn" address. Once they have a permanent address, there's no requirement to update the registration.
Once again, this is a busy-work, time-consuming inconvenience that's never solved a single crime. The new laws, however, will allow the state to do exactly what we warned registrations' real purpose will be -- confiscation.
I recommend not updating the registration address. If you ever buy & register a new gun, get a job, go to school, see a doctor, or breath air, they will already have your address in the new gun registration and/or RAPBACK at a minimum.
Since you do have to notify DMV of any change of address to get your license updated, I'm sure HPD will be able to find you.