"today, we'd be watching video replays..."
i read a science fiction novel recently ("great north road" by peter f hamilton), in which roads, buildings, walls, most surfaces were sprayed with nanobot-sized "smartcells" capable of recording video, and where police reconstruct a crime scene by integrating all such recordings (those which hadn't been electronically fried by the bad guys) holographically...
anyhow, your point is well taken... today's technology far exceeds what we dreamt was possible, and tomorrow's will do the same