M Products are proven purely by demand and if you compare 10 years back to today the market is more expansive for M Products and that is the sign of progress for the entire industry.
BMW M could not just survive with two models the M3 and M5 they had to expand that is why from 2005 the first expansion model the M6 came because there was demand from other markets for a high end performance model from BMW M.
As I mentioned a four is being considered but seems the more logical choice (in theory) in overall placement.
Now you know I always credit you more rather than register my dislike of your work. However that M2 or 2er? render makes me wretch like Chris Brown's music. This is what you should be looking at in terms of outline but not necessary the details but the headlights could be interesting...
Acknowledgement to Topspeed.com