I thought the service providers were already complaining about individual users clogging up "the pipes".
Giving a bigger bandwidth to end users is just asking for more backend network congestion.
Far from it, actually. Japan is the world leader in internet infrastructure.
See the recent study that quantified this into a "bandwidth quality score" for 42 countries. Japan's score was basically double everyone else. USA scored 16th, UK 24th.
And their population is only a little less than half of the United States, but being spread out over an area 25 times smaller is really what makes adoption a bit easier for them.