As I stated, I think that their contribution to environmental decay is exaggerated. I'm not quite sure it is greater.
I've done a little theory-crafting on the subject:
According to Bureau of Transportation Statistics and the US Census Bureaui n 2002, there where over 135 million passenger cars and 62 million light trucks (American language labels SUV’s as light trucks, however this statistic also includes vans and pickup trucks, this doesn't include larger SUV over 6 tonnes like Hummers).
Combining that statistic with the Corporate Average Fuel Economy standards (22.5mpg for light trucks and 27.3mpg for passenger cars), we can gather a sense the effect of light trucks in comparison to passenger cars.
From these statistics we can gather that fuel consumption at the current rate (all vehicles included) is approximately 25.7mpg. Theorising that SUV’s were abolished and replaced with passenger cars (ignoring the fact that more passenger cars would be needed to carry the same amount of passengers as the SUV’s), the new fuel economy average would be obviously be 27.3. This marks a mere 7% difference in fuel consumption if all light trucks were taken out of use.
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I mentioned seat capacity briefly in there, and I'm of the belief that if SUV's were used to capacity every time they were used, they would be more fuel efficient then a 5 seater car, or at very least, this supposed gap in fuel efficiency would decrease further.
However, this is not the case realistically, but I don't think it is the ethical responsibility of the car company to ensure that their vehicles are being used in a fuel efficient manner.
This applies to utility as well, to answer your original question. Unless there existed a system where SUVs where only purchased after a successful 'work' application has been filled out, I see no way for these vehicles to be restricted in production. A car company can't be responsible for the misuse of its product.
Even if a 'work' application were the prerequisite for purchasing an SUV, does this limit the choice of the consumer too much? If there is demand, why not sell it? Some soccer mums do use their SUVs for car pooling for the majority of the time. Is it fair to remove this freedom of choice from all?
But to answer your question, yes, I think SUVs have enough utility, when used for the purpose in which they were created and when seated to capacity most of the time. This outweighs their affect on the environment, also due to the fact I am unconvinced as to their damaging nature.
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Also, these stats didn't include large SUV's over 6 tonnes, which are classed differently and not subject to Fuel Economy Standards. The Hummer is the prime example of this type of vehicle. Purely luxury. Worse fuel economy than almost all other 'useful' SUVs and often driven by a single, affluent driver. And as you stated, these are primarily just status symbols.
I'm currently unsure whether the free will to buy these things should be inhibited for environmental good. Although Australia, where I live, restricts gun purchases for the greater good, shouldn't SUVs be the same, especially where they serve little purpose other than to prove affluency?