I think you will find a number of wealthy car buyers are rather easily manipulated by public opinion!
Top end car ownership is 95% about perception and image, no matter how well built and how well it drove.
The LF-A did sell (at a huge loss), what with its limited production run, it managed to sell in the USA, middle east and Japan. Only a few in Europe took a punt with one, and they got a bit of a ribbing from their peers.
Toyota have the resources to make a car faster/better/more reliable/ etc etc, its whether they can do it at a reasonable cost. A new Supra needs to be 2/3rds the price of an equivalent BMW or Porsche - there needs to be v.f.m.