You are intentionally conflating many different concepts, including car2car communications, to confuse this point. There is absolutely no need to connect the car to the internet to achieve any of these goals. However, if you don't have the car connected to the internet it becomes difficult to snoop on drivers and harvest information to sell to third-party marketing. It also makes it impossible to serve ads via infotainment platform. 

The future these shills are trying to sell you is one where every time you drive past McDonalds, your infotainment system is blaring at you voice and video ads for Big Mac.