Okay, how about predictive focusing. I catch my son playing soccer and the focus follows him as he runs through a crowd. Or I tag a car, bird, dog in a position where differentiation is easy then follow them through a group or into a background where image differentiation is harder (a black car from a grass background into heavy traffic). That's just processing power - something cameras should be able to handle - if not now then soon.
The 7D does this now. Just set the AF to slow.





