Flyover is fun, but Street View is far more useful and accurate. Also, it covers almost every single street in most major cities, which means chances are it will always work for you, without any exceptions. Can't say the same for flyover, unless Apple intends to cover to the same extent as Street View does...
What makes you think Apple doesn't intend to do this?
I don't expect Apple to try and duplicate Google's QuickTime VR approach, but Flyover couple easily morph into Walkthru, where you land on the street and see higher resolution images mapped onto more accurate 3D storefronts that you could view from any angle, and not just the ones where the Google StreetView camera clicked.
A later revision could allow you to enter certain public buildings and explore the inside in virtual reality fashion. It will be an empty world, or you can choose to have it populated by cars and "people".
Still later we'll have volumetric weather effects, and lighting effects, to simulate time of day.
To be sure, Google won't stick with the StreetView/QuickTime VR approach for much longer. It has served them well, but the future is even more interactive, and more real. They'll want to show more live data, like cars in a traffic jam, or empty streets, or throngs of people coming out of a stadium, to reflect the current, past, or predicted reality.
What Google and Apple (and X) will give us in our maps ten or so years into the future will make StreetView and Flyover seem antiquated.