Ya know, I wouldn't rule out the possibility of them coming back in vogue (ground straps, that is). Listened to a fellow from the American Petroleum Safety Society on a local radio talk show a few months ago who said that static-induced car fires at gasoline filling stations remain a significant problem. (The boom in self-serve gas pumps may be a contributing factor, since the static spark is often generated by the driver sliding across the seat on his way out of the vehicle.) Then, just yesterday I watched a news segment about it (on spanish-language TV, no less).
Take all the recent (and exaggerated, IMHO) concern about auto safety, factor in a high-dollar lawsuit settlement or two, and you may be able to look forward to ground straps joining daytime headlamps, ABS and side-curtain air bags on the list of semi-useful safety "features" offered by automakers.