I've been using iOS6 since the first beta and saw the backlash coming. I think "Street View" is Google Maps' killer feature and no amount of "3D View" is going to replace the ability to virtually drive your route (or see the storefront, the turn you need to make, etc.).
On the other hand, Google has a habit of releasing amazingly disruptive products (maps, gmail, etc.) and then the pace of innovation of each app slows dramatically. What was the last "innovation" gmail did? Priority inbox? Buying Sparrow?
I'm optimistic this is the start of an arms race in the mapping area (Apple: please tackle email next); this needed to occur sooner rather than later. We don't know the circumstances of the switch (it seems equally likely that Google precipitated the change as Apple did) but given Apple's knack for taking a MVP and continually, doggedly improving it, I think the future is bright for iOS Mapping.