I Don't Believe They're Gone For Good
I've indicated many times that I've never been a proponent of gluttonous, vanity driven consumption, but I understand and support individuals who truly do need an SUV. The problem is, most do not need one. (Ardent opinion warning!) And to that, I'll be very glad to see the number of SUVs drop on our roadways as these poseurs are forced to dump such vehicles in exchange for more sensible, economically sustainable, responsible transport.
That said, I don't believe this marks the end of SUVs by any measure. As soon as our society finds an alternative way to power our vehicles, people will start buying large again. I believe there's something about common human nature that compels many of us to secure ever larger, more showy forms of transportation, whether we really need it or not. Be it convictions that an SUV is "safer", be it the common thought, "I could off-road if I wanted to", or whatever-- There has to be a reason or set of reasons why SUVs were so popular in the first place. And that mindset won't just disappear. In fact, the only reason SUVs are currenty dying is because driving one kills your pocket book... That's the ONE thing that people will universally pay attention to. Safety? Environmental responsibility? Consideration for your fellow motorists? By and large, people don't really care about that. Money does the talking, baby.
So I think SUVs will be back. But at least by that time they won't be barfing out ~6 tons of emissions per year; at least not at the point of transport...