The hypothetical already exists, it's called the evening peak hours. I'm not familiar with every part of the US however in Europe most ISPs saw no need to throttle video as the current situation merely makes the usual peak last longer.
Or more, as now "watching on-line videos" doesn't compete with alternatives like "going out" or "being too tired after work to do anything but eat and sleep".
Why would it be 2x the normal evening peak hours? Yes, normally maybe second shift workers and the rolling shifts of people going out to eat would reduce normal peak usage slightly, but I can’t imagine it being 2x.
Because ordinarily, not everyone watches videos in the evening; people go visit each other, go out to bars, go on dates, etc. Now however, meeting and outside activities are unavailable.
