It won't be long for lawyers to get in on the game - that because you were driving a vehicle with a tall hood, you knew it was going to cause more damage and thus you should pay more damages to the person you hit.
Get that going a few times and the insurance industry will adjust rates appropriately so people who drive big vehicles now have to pay for significantly more liability insurance because their vehicles are more likely to cause more damage to people.
Shouldn't take more than a few years for it to be sorted out - a few legal cases by ambulance chasers, and a few changes to insurance policies and now there's a market push for smaller vehicles again.
And most of the push to larger vehicles isn't CAFE or whatever. It's car companies - big vehicles are simply more profitable. They could sell you an econobox for $15,000, but they'd really rather you buy the F950 for $150,000 instead. That monster truck probably makes about 4 econoboxes worth of profit. I did NOT say make 4 times as much profit as the econobox. I said 4 econoboxes worth of profit. Probably 20 times the profit of the econobox.