"The cost of a high quality digital scan is now in the mid 4 digit range (e.g., just $5,000, more or less), and with some additional expenditures to process the scan results, and perhaps to ship, prep, and clean the 1//1 scale car post-scan. This digital scan could at least give the overseas toolmakers a huge head start in capturing the subtle surface nuances of the original 1/1 scale designs. It would seem to me that the incremental cost of this up front expenditure would be more than offset by not having to retool body castings to correct mistakes that were the result of trying to design a model from 2D pictures alone. To me, personally, this is a much bigger issue than some embarrassing omissions or engraving on small engine parts."
Yes...it would be a step forward, but still you'll end up with scans of a 1:1 vehicle and it still needs to be translated to a 1/25 scale model, meaning tolerances, plastic thickness and molding concessions, can and will lead to differences between the final product and what used to roll of the line at the OEM.
It all still boils down to the human factor, time and the budget.