Awesome stuff, and impressive numbers..but Wow, people like to complain..christ. There was an M535i back in 1979, this labeling is nothing new get over it.
I think most can people grasp that an M with a single number is reserved for the most focused M models, and an M in front of a regular BMW number series are M "tuned" models not full fledged Ms.
Also if your worried about too many M badges, I think your missing the point. 1st these will not be HUGE volume sellers, and second if your worried about exclusivity buy a Porsche, or a lotus.