Wall Street has crashed into a US auto industry that's being run too well (F, GM)

•Wall Street has been rooting for a downturn in the auto market.
•The market is still at a high sales level as automakers continue to sell profitable trucks and SUVs.
In 2015 and 2016, the US auto market set consecutive sales records. Well over 17 million vehicles rolled off dealer lots each year.
With the baseline market in the US at roughly 15 million — the so-called "replacement rate" — sales growth couldn't continue forever.
But what's been alarming is the degree t