I made the mistake of going car shopping last weekend (not even realizing it was the last full weekend of "cash for clunkers") and I can honestly say I have never seen so many people in a car dealership. After about 30 mins of floundering around the lot (which was pretty scarce) I was approached by a salesman that told me straight out he had no idea what vehicles were still on the inventory!
I spoke to the sales manager who basically told me the same thing that you just mentioned. On the lot inventories are going to be reduced and you are going to find more and more people will actually be ordering vehicles rather than picking them out and driving them off the lots. That will also drive the price of the vehicles up and reduce most rebates as we know them.
Mike