Ultimately, it doesn't matter what the satnav companies do - there is a technology platform there, and people will exploit it. If we assume that in 10 years, pretty much every car will be connected to the internet, and that cars will "talk" to each other about traffic conditions etc, then there are a number of subversive things that will come out of this.
1) We have the current satnav company approach of listing the camera sites and pinging you on approach. How about subverting the cameras that will do lane/distance management and detecting them in real time? You could also detect which way they are facing, so be far more selective about when the ping goes off.
2) Real time detection of mobile speed detection vans. See a van - hit the touchscreen, have it reported to everyone.
3) Real time recognition of police cars. You can get ANPR for beans now, I'm thinking of putting a number plate reading camera at the bottom of our lane after being burgled one too many times. So, again subvert the forward facing camera on the car, and get it to read number plates and recognise the livery of a jam sandwich. Instantly you have a moving map of where the police are.
It is a bit like music piracy - it is an arms race. For every advance by one side, the other side counters it. This particular arms race could put some really dangerous tools in the hands of the wrong people, just like the music piracy arms race has.