Interestingly enough, a similar transition is happening to the Bentley Continental GT from the W12 to a blown V8. Today's
WSJ Review basically reveals how desirable the new engine is and more in line with the history of Bentley engines of yore: "...some of the greatest historic Bentleys had straight-eights, -sixes and even -fours (the 4½-liter supercharged "Blower" Bentleys), the turbo eight in the new car can be regarded as a return to form...."
So a blown inline six should go along with BMW tradition of potent smooth inline 6's and perhaps be a better experience to boot.
PL