Well perhaps, Dave. I think Sikorsky have taken the engineering approach most likely to yield a successful project. Moving away from an S69 led design would just be too risky. Like Nick comments, X2 improves Vh by sacrificing some hover performance.
Once X2 does "what it says on the tin", there will be plenty of opportunity for aerodynamic refinements. My own thoughts are that there will be opportunities for a helicopter entrepreneur to introduce active blade twist.
Remember successful innovators identify the market gap, and taylor their devlopment to fill it...