No “street address” for some?

When considering how many people are leaving behind conventional housing–that is, choosing to live in tiny houses on wheels, RVs, yurts, gypsy wagons, and so on–I wonder if there will come a time when a “street address” doesn’t apply, especially for those who live a more nomadic lifestyle.

And as the world becomes more electronic and paper (and a lot of the U.S. Post Office) goes away, might there be a time when a person’s “address” is simply their IP address? E.g., “If you need to contact me, I’m at”