Your theory requires that the sheeple have the independent thinking and intelligence required to veer away from the herd.
There are still many, many people around who've "always had Fords, and me dad always had Fords too". In the general mindset, Fiat make tinny little boxes that rust.
Mine came from a Subaru dealer. It was half the price of the equivalent age Subarus but still ignored.
That's because people don't go to a Subaru dealer really to buy FIAT's either. And it is still a franchise. I am talking about the independent (Joe's motors type of place) where they will buy and sell anything they think they can make a profit on. The people who go there do not tend to be as brand concious or loyal.