As Frank already pointed out, DX11 is not used in current games as those still need to support DirectX 9 for Xbox360.
Also I donīt see it as a reason against DirectX11, that it isnīt yet widely used in current games...
But if jcl decides to focus on other things in the near future, I canīt change that anyway, and I also am not sure if I want to, as he most probably has good reasons for his decisions.