How about a group of 4 friends who buy a game on steam together and want to download it and try it out together? That can easily be 30 gigabytes that has to be downloaded by 4 people, capping the connection over a sustained amount of time.
Sure, but does any public policy need to be directed towards this use case, or the six simultaneous Netflix streams? I would think that increasing Internet adoption by 1% would have more tangible gains than increasing speed by tenfold, once you are at figures like 5 or 10 Mbps.
Yes, because there are many use cases which will crop up once internet speeds aren't so constrained in so many places. If you could download very large files very quickly in almost every location, I'm fairly sure that computing would change rather dramatically.
What do you think would have more effect on the world: Increasing processing power 100-fold, or increasing desktop usage by 1% of the entire world population? How about 10-fold and 5%? I can guarantee you it's the former.