Sorry, but it does not take 4,000 employees to work on a Maps application...granted there are some non-technical managers and HR folk...the actual number of employees diligently working on a Maps application should hover somewhere around 1000 at most. Depending on exactly what Apple is doing, Apple should only need:
100 developers
5-10 developer managers
1 Product Manager
300-400 people driving around in cars recording the routes, pictures, video, etc.
100 people to tag/input/validate information going into the Maps database(s)
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611 people on the high side...add a few hundred more drivers depending on how quickly you want to "map" everything out and/or what regions/states you want to do quickest/first.
Apple is years behind Google and other Map apps/companies. Apple should just throw in the towel...concentrate on building a great product/OS and let the 3rd party app developers prosper. Sure, the OS needs to come with some useful apps but Maps doesn't need to be the world leader...and it's clear Apple Maps is far from the best. It doesn't need to be the best unless of course Apple wishes to market/advertise to you and track you all day long (gasp! would Apple EVER do that? Noooooo. /sarcasm)