BMW has determined that the traits that made its cars unique and desirable in the past, and confidence in its identity could be diluted, and wouldn't hurt its business, which is as good as it has even been.
Even in the past, the special traits that satisfied the minority of enthusiasts went unnoticed by the majority of their customers. Moving closer to the mainstream has cost them the former, but not hurt them with the latter, and that's that.
The enthusiasts that can afford them have moved on to other marques that still offer those traits, like the one in Stuttgart. Others buy and hold onto the old classic BMWs.
I also get the impression that the Quandt children are less interested in the business, and could even have dissenting views about it, which is not unusual for family-held companies. Could Kiley's book be written about today's BMW? I dunno.