The problem with SB is that it has itself in a pigeonhole. While the tank aspect of the game is good, the rest falls pretty flat in terms of a combined arms sim.
On their forums, I've argued for the development of other aspects of the game (infantry, CAS, CCA) with lots of push-back. The attitude being: this is an armor sim, not an infantry sim.
My viewpoint has always been, why limit yourself to an armor sim and not a full combined arms sim. I dont think ArmA does it very well, and whomever can produce something even remotely decent will find itself with a decently-sized community behind it.
I'm really hoping DCS can fill the void of combined arms games.