BMW, you have already thrown your own M history out the window, lit it on fire on fire, and then peed on it. An M7 will not change much of anything when you are already selling M SUV's and sticking an M badge on just about anything you can. An M7 actually makes far more sense than many of the M models you are already selling so just do it already. It's only a matter of time.
With Mercedes and Audi both having sporty models of their top of the line sedans an M7 to compete with the S8 and Mercedes S63 AMG is clearly missing in the lineup. You want one Biermann? Well aren't you the head of M? Make it happen.