Goodyear also makes run-flat tires...look for the "EMT" designation.

Run-flats are one reason why the 2002-2003 BMWs had a pretty bad ride in Europe. The carmakers have to retune the suspension to account for the stiffer sidewalls of these tires (which are the primary reason why they're run-flats in the first place). By 2004 the Munich boys sorted out the suspensions.

If anything, there's a chance we'll see more run-flats as standard-fit items in newer cars. For example, Honda Japan sells its new GE-series Jazz/Fit without a spare tire because it's shod with run-flats and comes with a puncture repair kit.