Do you know how people did analytics in pre-GA days? By parsing access.log files. I don't think anyone could have imagined web analytics will grow so big as it is now.

Yes, fleet tracking software already exists but don't think that it can grow only till we scale it to certain level and add some extra features. There will be myriad of possibilities when this data is easy to access. Currently, it is limited to only those companies who can procure the GPS devices, and install it for their customers which translated to high barrier to entry and CAC costs.