Bill,
We may have to agree to disagree on this one. Advertising works when people are predisposed to purchase something. Advertising will not create demand by itself. The smoking example you cite is an example of this. People who smoked or were thinking of taking up smoking may have been influenced by the Marloboro man. People who were loyal to another brand or the nonsmokers couldn't have cared less about Marloboro's advertising. The car companies or any other company for that matter will not spend the advertising dollars on items that are not selling.
Yes, the SUV's and the crossovers are big money makers for the car companies, but when cars were selling, the same was true about the big cars. This same debate raged back then too. The difference is that it was the big car versus the little car. Americans preferred the bigger cars. The only time this preference did not hold true was when gas prices spiked. When gas prices moderated, people went back to their preference for the big cars.
There will always be people who will buy something to follow some celebrity or to keep up with a neighbor, but those people will not push the needle very far. When Jennifer Anniston was the "it girl" and Friends was one of "the" shows on TV, Anniston would model a new hair style most every new season. A fair number of women would rush to their hair salons to get this style. The hair salons noted the uptick in sales and hair style requests, but it never lasted very long. Usually within 3 - 6 months, the women were going back to their old hair styles.
Since this thread was started by Ford's CEO stating he will be cutting many car lines, we will see if he is correct in his assessment of the car market. Several years ago, J.C. Penney hired a new CEO who changed the way the company priced its products. He completely misread the Penney's customer, and in 18 - 24 months, he almost took the company down. There are some retail analysts who believe the company may never come back from this person's debacle.