GPS on bodies like the 1D or 5D series makes no sense to me, either - is there a pro here who is actually using that? Do you then look at the pins on iPhoto to see where you had your shootings, in case you forgot?
I would expect that a lot of pros use their pro camera when on vacations rather than buying a whole separate camera just for that. So I would expect the percentage of pros who use GPS to be very nearly identical to the percentage of non-pros who use GPS. I could be wrong. They just use it less often as a percentage of the camera's life.
If it were free, I would be fine with GPS whether I used it or not. It is approaching free in terms of cost, but it is not free from a battery drain perspective. I wouldn't want it unless it truly turns off.
It truly turns off. Well, I suppose the component draws a trickle of power so that the camera can tell it to turn on, but other than that....
Agree with most of what you said, except the integrated GPS though. Would compromise the body frame in it (would be like a 70D model).
There are ways to have antennas on devices with metal enclosures without compromising the integrity of the body. The key is in either mounting them behind the display bezel, using strip antennas mounted in a small indentation in the metal body that is then covered with a plastic or rubber cover, using part of the camera body itself as an antenna (iPhone 4, anyone?), or even integrating the antenna into a new line of upgraded lenses.
That said, if they're already doing integrated Wi-Fi, the cheapest way to add GPS is to provide integrated Bluetooth. You can use the same antenna for Bluetooth and Wi-Fi, but Bluetooth can be paired with any number of off-the-shelf Bluetooth GPS receivers. That also has the advantage of having less battery drain on the camera side of things in addition to the much easier-to-meet antenna requirements. It's not quite as convenient as built-in GPS, but having to carry a receiver in your camera bag is a far cry from having to either give up your hot shoe or have a receiver hanging from the side of your camera.
It boggles my mind that they're shipping bodies with Wi-Fi and no Bluetooth. Sure, Bluetooth is slow, but if you're uploading pictures through your phone, it's still likely to be as fast as or faster than the cellular network on the other side unless you happen to be in an LTE coverage area. And it uses a lot less battery power than Wi-Fi. But I digress.