I don't know about the head injuries. I suspect through a combination of equipment and rules changes that will get under control. Lots of interesting work in this area. One interesting finding about concussions is that women and girls tend to get significantly more than men in the same sports. In high school basketball, for example, girls have 4 times as many concussions as boys. In soccer it isn't as dramatic, but it is still pretty significant, something like 1.5 times more. While neither were as high as football, for every sport where both boys and girls compete, the rate for girls is dramatically higher.
But football has dealt with things like htis before and managed the problem. During the 1970s and into the early 1980s, huge numbers of stars went down with knee injuries, many attributed to artifical playing surfaces. Knee injuries still occur, of course, but not nearly at the same rates they did at that time. A number of factors contributed including new surfaces like field turf with more give than the old astro-turf fields, better equipment, and various rules changes like "in the grasp" and some blocking rules. I anticipate we'll see similar things happening with regard to football going forward.