pma - thanks for keeping this thread updated.
As I've mentioned before, I don't think the dealers will have much luck trying to change the NADA's valuation system. My bet is this division of NADA is a "cash cow" and they don't want to make any changes which may scare off the banks.
I think it's more likely the banks will drop NADA once the credit markets free-up again. I think one of the major banks will start using Manheim or some other "real time" valuation model in an effort to gain market share. Once that happens all the other players will follow the same course and the NADA Book will die a lingering death.