Pedigree and tradition are two concepts that do not belong among the top considerations for the BMW powerplant. People who would gladly trade the superior power, torque, and weight of a TT V6 for an inline 6 just because it was "how things were done" are in the M3 market for the wrong reason.
To me, this is akin to all the bozos who complained about the C6 Corvette not having pop-up headlights like traditional Corvettes.
After faltering with the E90 powerplant and being embarrassed by Ford Mustangs, BMW has to bring their A-game and needs to get into the horsepower wars with their halo car. There are too many incredible compelling performance options in the $60,000-$80,000 range...BMW can't coast on goodwill and fond memories any longer.