Yeah I know that, but Windows is most probably the larger uberbase, and it would give people something to do while waiting... and plus, nearly everyone has Windows™
It would probably do more harm than good in the long run. Aside from the significant amount of work involved (BMax's core is entirely different than the B3D framework), he would still have to develop a Mac/Linux version to maintain the cross-platform deal which is one of the big selling points.
It would set back the release date of the cross-platform stuff significantly, it would lead to TWO 'official' modules, a lot more long-term support headaches for BRL, etc.
I would be very surprised if they would even seriously consider this.