> The crossover/SUV/Truck sales is the most interesting to me. I wonder if that will self-perpetuate, since the presence of larger vehicles seem to make other drivers feel less safe, which make them want larger vehicles, which makes the remaining sedan owners feel less safe....

It's not just the mass of the vehicle too. Here in southern California it definitely seems like there's an arms race of headlight brightness where the victims are smaller/lower cars, especially those without dimming mirrors. I really wish the authorities (or maybe insurance) started looking into headlight brightness/angling.