if there were to ever be a man able to deflect a punch and return a crippling KO blow, well, watching MMA would be even more enjoyable.
MMA will progress, and it will become more technical. And I am sure that within 20 years, you will be seeing more of Kung Fu in MMA. But why don't we see it now? Well, first the techniques in Kung Fu require serious reflexes. Second, no prominent MMA school teaches Kung Fu. They might voluntarily, or involuntarily use a couple pages out of the book, but it will never truly stay Kung Fu. Hence is the reason why Bruce Lee invented JKD.
Bruce Lee knew, years before MMA, that fighting does not only require strikes, but also joint manipulation and grappling. "keep what is useful, reject what is not".
Third, many Kung Fu blows are intended to be deadly, or to permanently cripple the opponent. Hard shots to the groin, eye gouging, throat strikes, heart punches, etc.
IF you truly want to see the future of MMA, look at the likes of Jon Jones and Lyoto Machida. Some call it flashy, but I truly believe that they fight the way they do because of its efficacy.