The Past
Everything probably changes every ten years, leaving aching memories of how things use to be.
And you'll never get universal agreement on the past. Some folks were never there.
Besides, wait til they get these cams to show simultaneous and multiple digital images on the advanced personal cell phones. Why a hunter will be able to call in an attack from a UAV( manned aerial vehicle for the old folks) on any antlered deer, who dares to show his face, in a ten mile perimeter. Then someone will really fondly think of -the past.