It's a bit silly (for only one date) because there is such a massive demand. It is a bit selfish to do just one show. If that is it we probably shouldn't have takebn[sic] the genie out of the bottle... (Guitar World)
Of course, Zeppelin is not a democracy, and Robert Plant has been the guy who refuses for years. None the less, it sounds like there is lobbying going on, and when the boys saw the reaction the news of the 02 show got, they have to be considering it.
Or put another way, that's one vote we got, now the lobbying of the others can begin.