As I posted on Digg, I don't think this is going to be anything other than a headache for people (I mean seriously when you have an emergency do you Google Map the route to the hospital or do you call 911) but as
EP pointed out to me, having to answer a ton of wrong number calls will at the very least make you less efficient, and could distract you from doing your job and stress you out enough to where you make a mistake.
Pretty much it's just not a good situation to put people in.