HD file sizes are a lot smaller when they are on your computer in format such as divx or mp4 and many other good compression codecs.
Similar to the way DVD works, when you convert them so that they would play on the household regular players, the filesize usually tripple as a mininum. Why? I haven't got curious enough to find that out... yet
Also, broadband connection in north america hadn't progress much. I still am using the same speed as I did 5 years ago. Meanwhile, places such as Japan are getting 3x speed and paying 1/3 of what we get here. Or something like that.
Why our technology isn't going anywhere is entirely another issue.