It's very obvious that that yall are some talented as hell people. You've made BF1942 into the game that so many have wished for and done an outstanding job at it! So my question is simply, why don't yall make your own WW II game? I for one would be first in line to buy it!
It's not really that simple. They have modellers, skinners, 'coders', and mappers. If they made their own game, they'd need to build (or license) a 3d engine, which is incredibly complicated and/or expensive. They'd need to do everything from scratch.
With bf1942 they can build off of an existing engine, which already has 60% of the work done, and they can concentrate on making the new models and physics they want.
Often modding experiance is the first step to becomming a proffessional game-designer. If they keep up the good work, they might have a similar fate to Thrauma Studions (DC team)...