gotta love studies. especially when they point out the obvious. not like physics changed when we weren't looking.
i own 2 cars: one weighs about 1800 lbs (almost totally gutted - has front seats and door panels, but no soundproofing, etc. plus extraneous stuff like a/c has been yanked too), and the other about 5000 lbs. gee, which one is safer in an accident? the 2.5 ton sedan. duh. which one will be more likely to avoid an accident? the sub-1 ton race car. problem is, the Jaguar is a lot more comfortable than the gutted Honda.
consumers will almost always go for comfort over conscience.
plus, it would be kind of difficult for all of the "Super-Sized" members of our society to wedge themselves into economy cars...