IMO Sony are stuck in a rut... I think they make good quality entry-mid range cameras but are a little lacking in the enthusiast-pro areas.
The problem is... its the lower end consumer that is more likely to buy Sony. Professionals are much more likely to buy Canon/Nikon and most wont be persuaded otherwise.
Now, as a sony executive, do you invest millions into R&D of a high end camera aimed at professionals that may not get bought by many, or do you invest in the entry level cameras that are much more affordable to consumers?
They have almost created a trench, and subsequently got stuck in it. Pro togs see Sony as inferior to the Canons and Nikons of the world, so dont buy them, and Sony are accepting that and not trying to break into the high end marketplace.
IMO sony should release an A950 or similar, aimed at the Pro togs, with better high ISO performance, thus competing with the high end Canons and Nikons, but to do so would cost a lot of money, and may not be succesful, but if they did it, they may be pleasantly surprised!