I can see how recent findings on the severity of head trauma and the long term effects of concussions will lead to banning kicks to the head (unless padded kick boots are used) and possibly any strikes to the head other than forearms. With that, it's going to start to resemble Pancrase and eventually Catch Wrestling more and more. There are ways of definitively ending a fight without using strikes to the head. A submission is the most definitive ending of all because it's the only one in which one man actually says "I quit." The future of fighting is going to favor the fighters most adept at submitting their opponents i.e. favor technical wrestlers over brawlers.