And yet there are kids observing this play out right now, who never knew a world where Twitter (or more broadly, a mass communication "brand" of some sort) wasn't the primary platform by which world leaders directly communicate with their polities, not to mention each other.

The perceptive shift in which it is subconsciously accepted as normal that "any given world leader can be silenced by corporate entity XYZ" (and that conventional diplomatic apparatus is seen as a fusty, high-friction secondary channel to be bypassed when politically expedient) this goes a lot deeper than Twitter or Trump and may have significant repercussions once generational effects start kicking in.