Bingo. People think that buyers want RWD high performance vehicles because that's what gets the publicity. When in fact they're niche vehicles and a lot of those vehicles are sold because of the badge, the prestige and the service experience rather than performance and Cadillac and Lincoln can't match that right now.
The volume is in small to midsized sedans, crossovers and suvs and those don't have to be high performance RWD to be successful. Look at the Lexus ES and RX - those are the poster children for a successful high volume luxury brand.