One thing those reports fail to address is whether the concussion is incurred by the tackled player or the tackler. A lot of the current concern is traced back to George North getting concussed twice in a game in 2015: once from being kicked in the head while diving on the ball and then as the tackler (head or shoulder clash?). My casual observation is that a significant proportion of head-injuries are incurred by the tackler either through poor technique or bad luck, but also because the player being tackled is (with some notable exceptions) not censured for leading with a hip, elbow, knee or shoulder. All the protection goes to the player with ball and none to the tackler. Combine this with increasing pressure to tackle aggressively and try to force the opposition backwards leading to greater impact between players. Talk of lowering the tackle-zone even further might only make things worse.
Doesn't explain other injuries - knees, soft-tissue etc - escalating though.