Is there a location aware wifi option (or app) that enables wifi at a specific location (home) and automatically disables it when you are away from the specified location?

Question

I manually turn off my wifi when leaving home for several reasons:
1. I don't want my wifi to be on and constantly scanning wifi networks while I am away from home due to privacy reasons.  Many retail stores and airports are now tracking users based on their smartphone's wifi pings.  They can then store your phone's MAC address (the unique identifier of your phone) to determine how often you visit the store and where you go within the store.  It's just a matter of time before they match up your phone's MAC address with your credit card/payment info and then to your identity.  The only way to subvert this is to turn off your phone's wifi.
2. For security reasons: Wifi access points can track devices that broadcast their wifi signal, even if they don't ever actually connect to the access point's network.  These access points can then store your device's details including your phone's MAC address.  Once your phone's MAC address is discovered, it can be targeted by a hacker.  In addition, there are multiple well known hacker tools that can be used to scan for smartphone wifi signals in order to detect and then hack your iphone.  Bottom line: if your wifi is discoverable, then your device is hackable.
3. I believe it would save battery life if the iphone's wifi is not on and constantly scanning for networks all the time.
There are other reasons as well, but the above are my 3 main reasons for asking about this.
The reminders app is location aware - you can set reminders to alert you when you are at a specific location.  So, why not provide the option (or an app) to only enable wifi when you are at home - or any other location where you have an authorized or trusted wifi?
As it is right now, the iphone's wifi is broadcasting 24/7 everywhere you go.  Not great for privacy & security.  When I turn off my wifi, the phone uses my 4G plan for data and GPS for location services... so wifi is not needed at all for data or location services while I am away from home (and no, wifi does not improve location accuracy, that is a fallacy... there is nothing within the wifi protocol that could ever improve location accuracy).  But the point is, wifi should have a location aware option.  Otherwise, it's just a matter of time before there is a headline story about how not having this feature is a huge security/privacy problem.

Answer 1

Understood.  However, the point that I'm trying to make is that it's not the WiFi access point's security that's in question, it's having your phone's WiFi in an always-on mode that's in question.  It's simple: if your phone's WiFi is on, then it is both discoverable and hackable... even when it's not connected to a WiFi network or access point.  Here's an article about a drone in London that was created to hack smartphone WiFi signals (and hackers have been doing what this drone does for years):
http://money.cnn.com/2014/03/20/technology/security/drone-phone/
The point is that it's not  secure to have your phone's WiFi in an always-on mode.  It would be better for privacy and security if Apple made WiFi location aware so that it is only enabled when you are at a trusted location (e.g. your home or office).  Or, at least give us the option of location aware WiFi so that each user can determine the best mode for their phone:
(1) Always-On (current default - not secure and many privacy issues).
(2) Trusted mode (only on at trusted locations).
(3) Off.