Sure, but ignoring doesn't solve the problem of signalling channel saturation – if there is something to ignore, it means that some scarce resource has already been consumed.
That's fine if you need to tell a few terrestrial clients to go away every few minutes or so (until they finally give up until the next reboot or so), but I could imagine it being much more tricky when you're talking about cell sizes with a diameter of hundreds of kilometers.
> wouldn't this primarily be activated in very desolate areas?
It would be enabled globally (to fill in coverage gaps etc), I'd assume – and even in very remote areas, you might easily have a sizeable number of devices per square kilometer. A typical cell size (for Iridum, as an example) is 250 miles of diameter – that's the area of New York state! And that's not even considering overlaps of remote and densely populated areas.