The potential of video games on impacting mental issues is something that is possible in my opinion. Not only this but as you mentioned in this post they are also very engaging for cognitive development. I speak from person experience. My wife as been playing puzzle and word games for a while now and I must say she has gotten good at them. Her vocabulary has increased. It is for this reason that I believe video games are going t have a massive impact on how we approach human psychology in the near future.