Well, let me clarify by saying that I opted for a 24 month lease on my 335i, because I plan on purchasing the new M3.
I personally enjoy high red lines, when I'm driving on pedestrian road ways, because frankly, it's fun.
However, again, NO ONE that is a serious track devotee is going to purchase an M3 for the track. I'm sure there will be owners that use their cars for dual purpose, but not that often. The point is that the car is not suited for the track, it's too heavy.
So, while the engine is a gem, it's in the wrong shell and there's no point in discussing it's track orientation.