They won't, but some people will - the kind of people who are looking to buy a car next year (like me) once the have more money in the bank. Now they'll need that bit less money.
People like me, trading up from their crappy-small-car-to-drive-for-their-first-year may now be able to afford a nearly new car rather than an older one.
But it hasnt changed your stance, you were going to buy a newer car anyway, the dealer was still going to make money from you, all thats happened is you get a slightly newer car.

