It's not so much about how invasive it is, if it was invasive there'd probably be a lot more resistance to it.Hmm the way things are shifting I can't see it being so invasive years down the line.
Don't get me wrong as like snowdog said it has its place in things like mobile devices but for devices that can be physically secured behind locked doors and private networks it has no place, giving away the power of what software you're allowed to run to X company and making it so there's no way to avoid being tracked on the internet is asking for trouble down the road.