Actually this has been done, but –
From ANN –
Tokyo’s Akihabara District to Test Electronic Guides
Akihabara, Tokyo’s shopping district for electronics and popular culture, will test a new electronic guide system that uses free IC (integrated circuit) cards and street-mounted data terminals starting October 19.
Ray’s take: I figured it’d start in Akiba. Next thing you know, underground access terminals for information on cosplay enko, uncensored hentai live, and special service cosplay cafes…Oh wait, we each have an “underground terminal” right in our homes already…Have fun fighting over these cards!