Gas prices not driving cars down

NineShift has always maintained that the high price of gas is not why cars are in decline.
The high gas prices help the transition to trains, but the main reason is that you cannot work and drive.

We've wondered, however, whether hay prices were similarly high in 1908, as carriages went into decline.
Car sales are on pace to decline 10% from 2000 to 2010, just like carriage sales declined 10% from 1900 to 1910.

But, according to this New York Times story from 1908, hay prices were low that year. 
Either way, hay prices of course had no impact on the decline of the horse and buggy.
(Photo courtesy of freefoto.com)
Just like gas prices have no serious impact on the decline of the car today.