I agree that it won't put more bikes on the roads. I agree that's it's not about that. But, really, many aren't buying new cars. Unsure of job security, economy, whatever you want to pin it on, many people have reduced spending in general. Their are fewer overall new car sales, not people driving. It is a "slowdown" in US auto sales, foreign and domestic. You are right that people are buying with other companies, but as a whole, people are buying less. This is all IMHO.
edit: 'Fantasminha' has the right idea, this isn't worth a flame war, just a discussion. thanks.