Yes, you can also be tracked via CCTV, your payments, bioinformatics and general information, it's easy to build profiles for most people and knowing pretty much where they'll be and when.
And much more precisely via wifi - the local mall offers its shop very specific information on shopper browsing habits this way.
What about using voip such as Google voice?
Still need internet connection, tracking a device over wireless is arguably just as easy, even if you rotate your mac addresses.