What happens when the 2.4GHz band becomes so congested that it’s unusable?

Bob Cringeley can sometimes be irritating (because of the way he makes himself a central part of any story), but even his sternest critic has to admit that he’s very good at explaining complex issues. As here, for example. The basic puzzle is this: according to reliable sources, a company called Fusion Lighting has developed a new kind of street lamp. It gives off radiation in the unregulated 2.4GHz band used by 802.11b — so much so that it is claimed that a single bulb can shut down WiFi nets with half a mile. Why then, asks Cringeley, is the WiFi industry not up in arms about this outrageous threat to its technology? Answer: because the industry has already sussed that 802.11b is on its way to commodification (i.e. low profit margins) and would like to move us quickly onto 802.11a — more expensive (and therefore more profitable) kit operating in the 5GHz band. Hmmm… sounds plausible.