It's hard to say, with the bulk of the price increases coming in the last half of the year.  I'd like to see the scrappage rates in another year.

I've been a lifelong car guy, so TOD is a bit painful for me.  From what I've read recently, a stigma is developing in urban settings, and only among some people, against the use of large SUVs and pickups by those who don't need them for work.  This, combined with the fuel penalty of SUV use, suggests that light trucks will be driven less in situations where there is a choice of a more fuel-efficient vehicle.  I can't find a reference at the moment, but the fuel penalty of using an average light truck in place of an average car is about 42%.  Using the light truck adds an extra 2 tonnes of greenhouse gas emissions over a distance of 16,000 miles.  

See Figure 3.3 on page 14 of this .pdf for a graph on automobile survival rates. Eyeballing this graph, we can expect about half of all 1990 model year vehicles to still be on the road in 2007.  The sad irony is that the people driving older vehicles will tend to lack the means to purchase more efficient vehicles, but will feel the crunch of higher fuel prices most acutely.