$4 gas will certainly change habits. It just takes a long time. As number of defaults starts to rise you'll see a much more rapid change.
I have money for a bigger car, but don't base my buying on how much money I have. I had my fun on a used $3K Ninja ZX6E. Why waste money on huge car engines when bikes are cheaper and much faster?!?!
I car pool to work with my wife in a 13 year old Honda Civic CX 1.5L Again, this is fine for my *NEEDS* even if it is not much "fun" If I change my job and we stop driving together I will downsize. Last time it was a 0.6L motorcycle and this time it will be Smart 1L car. Again, 1L engine is what I *NEED* and is a lot cheaper than bigger machines.
I hear you about your frustration - we try to save while most anyone else doesn't care/try. I feel that way too, especially when I am being passed by SUV and vans. Still, long term we'll have a better financial state while others will be in trouble. So habits will change one way or another (easy or hard way).
While I don't want to judge others or tell them what to do or not do, we *ALL* have some sort of responsibilities to others and our children, like not leaving them with a several trillion debt to pay, fubared enivronment and $10/gal gasoline. People seem to be interested far more in their rights and far less in their responsibilities these days. Look where it got us thus far.