Everything in the films is about having the fastest, shiniest, and newest versions. As a country, America has always been one to encourage consumerism regardless of necessity. It's nearly impossible to watch 5 minutes of television without being bombarded with car commercials selling their "New and Improved" model.
Keep in mind, only the strongest and most developed Transformers can survive. It's as if director Michael Bay is trying to convince his audiences that they can only survive and thrive as a person if they indulge in the consumerism of the nation. If you do so, all your problems in life simply vanish, as long as you have that car.
An integral element of the Transformers is that they are always changing and never really keep the same form. Audience members watching the movies are thrilled when their favorite character changes into a new and improved fashion, completely forgetting how much they adored their prior appearance. In the same manner, the American economy constantly convinces consumers into purchasing new products that are essentially identical to the last. As a nation, we are constantly transforming. Whether our next version will be better, that is unknown.