The insatiable quest for more and more bandwidth already is creating this exact problem in other services. If you are a mobile user of Sirius/XM Radio you’ve probably noted occasional signal dropouts not attributable to buildings, terrain or thick vegetation. Most often it’s the result of a nearby cellphone tower which, transmitting on a different but nearby frequency, is blasting your XM receiver with a signal level so strong that it desensitizes the poor XM unit. This is of course merely a minor irritation affecting a limited user base. With GPS the consumer user base is much larger and in many cases is using devices that depend on tiny inexpensive integrated chip/antenna receivers that were never designed to function while subjected to high signal levels on nearby frequencies. It’s going to be a fun experiment.