How is focusing on the future doing a disservice to anyone? We're at the very beginning of the mobile-optimized web, and the future is still unclear. There's still room to define it. Supporting the equivalent of IE6 on mobile devices seems like a waste of time to me, especially after we've just spent a decade watching the evolution of the desktop web be stunted by obsessive focus on backwards/cross compatibility.

Also, nearly all major device manufacturers have committed to using WebKit. In five years, how many mobile devices will not run WebKit? If Windows Phone 7 isn't dead by then, it might be the only one.