Cadillac management. Obviously, they don't feel the demographics of the anticipated customer base would go in that direction.
Cadillacs 'problem' is the never ending rebate programs that they have acclimated the customers to expect. If you rebate it, it sells, if you don't, it sits. At this point I don't see design as being all that important. Caddy is under some serious price pressure from the imports ( German especially ) as only Lexus has managed to 'maintain'on the Asian side.
Their reluctance to go the 'super sporty or 2 seater' route is well documented by the abysmal failure the Cadillac XLR. Once burned.....