What is the range of LE in a place with lots of people all using BtLE equipped phones? My limited experience suggests that if it's working in those circumstances you simply need to look around you.
Or is Apple thinking of some peer to peer mesh? In which case (a) battery draining and (b) potentially useful to criminals. Though thinking about it, the application would be that anyway as the Bt will need to be discoverable.
Perhaps I'm wrong...they would have thought of these things, wouldn't they? Large companies never file junk patent applications, do they?