The main reason against the sedan is fears that it would cannibalize sales of the existing front-drive Lucerne. Both cars are similar in size and offer V6 and V8 drivetrains. Lutz said "they were worried that it wasn't going to be 'plus' business, and we had to worry about the substitution rate," adding "so for excellent business reasons, we elected not to do it."
There may still be the day where Buick offers a RWD sedan in the US. The GM division will still sell Statesman saloons in China rebadged as Buicks, and Lutz has admitted that "once that vehicle exists, it would be a little hard to see why you wouldn't use it for the whole market."