Everyone not having a camera on them at all times.
Will never happen but nowadays I feel people are more inclined to stop and film vs help/mind their own business when shit happens.
And also just enjoying things as they happen. We don't need to be recording fireworks to watch later lol.
Yeah, I remember when I was in high school, all the cool kids were like, "pfft, you've got a camera on you? Lame.".