I wonder if street addresses are on the way out. GPS makes it easier to use satellite coordinates, and we'd avoid the problems currently cropping up where suburb boundaries shift and different systems have different maps. I know of a few places where most GPS maps think a street is in one suburb and the post office thinks it's in another.
Of course, both of those problems can be fixed by smarter search (that doesn't depend on an exact suburb match) and always-online maps, so we're more likely to see advancements in maps and search rather than wholesale replacement of the old system.
Mokalus of Borg
PS - I'd love to have Google Maps built into my car stereo.
PPS - But that's another story.