[jessaustin]

...if Urbit gets popular enough for the 32-bit limit to matter.

I'm trying to think of a 32-bit address space that was found to be too small... I know there was one, it's on the tip of my tongue...

[throwanem]

That was an address space for computers, not people.

[defen]

The stated reason is that Urbit addresses are for "responsible adults", and that each responsible adult will have 1 address. Each address has 96 bits worth of subordinate addresses, so you should be able to give all of your devices, dependants, etc an address.