Bluetooth, 802.11b and 802.11g all run on the same frequency - that being 2.4GHz.
While I see the advantage of a wireless mouse, that being no cable to drag around as you move the mouse. I see less advantage to a wireless keyboard unless you keep the keyboard on your lap.
I do like having the availability of a USB port right at my fingertips so to speak. And I keep my keyboard on the desk, so a keyboard cable doesn't bother me really.
Also, you run into the problem of how many computers are in a small area. Will that many bluetooth keyboards and mice work well together.
And there is the issue with hospitals that can't have "radio broadcasts" due to some of the electronics in use. Bluetooth keyboards and mice (if offered) should be an option, not the default.
Of course there is the issue of how do you set up a bluetooth mouse and keyboard without a wired set to permit access? I think each bluetooth device has to be registered with the system.
And of course the power issue? Do you keep changing batteries on the mouse and keyboard? Get 2 sets of rechargables and keep one in the charger at all times?
I'll be sticking with wired keyboards and mice for a long while yet.