Plenty of letters left...
I was an ISP (Internet Service Provider in the late 90's on the Gold Coast and Brisbane. It was, of course a different world back then. Speeds were 33.6 Kbps, quite literally a thousand times slower than today!
That was with 'dialup' as it was known, all by telephone. If somebody rang you, you got disconnected! Then you had to redial (sometimes a dozen times) it could take an hour.. 3 cups of coffee.
Then a new protocol came out and speeds went up to 56Kps. Amazing! This was when I jumped into the internet pool, previously I had experience with the 'net as a webmaster, my first site in Nov 1995. Speeds were:
(From http://whirlpool.net.au/wiki/d_u_m_h)
Typical modem speeds progressed through 1200, 2400, 4800 and 9600 bps.
Modem speeds were increased to 14.4 kilobits per second by 1991.
Then, in 1994, it doubled to 28.8 kilobits per second.
Soon after, there came 33.6kbps, which was thought to be an upper limit for phone line transmissions.
But along came the 56k modem, and a new set of standards, so the speeds continue to push the envelope of the capacity of the telephone system.
The 56K modem was invented by Dr. Brent Townshend in 1996.
Alta Vista, Excite, Yahoo - These were the search engines I cut my teeth on in 1994. Quickly more came in the 'bubble days. Dogpile (smart name if yucky), Ask Jeeves were next. 1998 saw Google and MSN appear (what happened to MSN? it became bing, then Live search).
It all changes, daily , weekly, monthly.
So, expect change with NBN; probably before it even rolls out!
For examlasernetple, Laser/Millimetere microwave is already here: http://www.networkworld.com/article/2852176/lan-wan/using-lasers-for-backhaul-internet.html
Combine this with the high altitude static (heliostats) balloons and that is the way of the future, not digging up roads and pulling old manky copper in and out of pits! Google is betting on Balloonidrones, Facebook on drones. Both are SO much faster than
Googles plan is for using Drones, solar powered high altitude satellite! I remember in 1965 'Early Bird' (or more official,and boring 'Intelsat1
) vindicated Arthur C Clarke's WWII prediction for geosynchronous orbit communications to cover the planet. In fact the orbit is known as a 'Clarke Orbit' in honor of this softly spoken Somerset lad!
Point being about satellites igoogleibaloons physics plays a part, which as
Google's plan - high altitude balloons
'Scotty' would say -"Ye canna change the laws of physics cap'n'. It is 36,000 kn or so, straight up to a satellite in a Clarke orbit and the same back down. Light goes at 300,000 km/sec.
I'ts a long way to the satellite and back...internet-internet_access_using_satellite_connection

The practical upshot of this is that it takes 119 milliseconds or 0.19 seconds (call it 1/20th of a second). Now that doesn't sound like much, however - compared to Fibre, to nodes, homes or through the air it is S-L-O-W. Just to add insult to injury, there is the problem of latency, routing and all sorts of other 'traffic jams' on the ground before the damned signal gets to your computer! Which might be slow, anyway.

It's complicated.

Andrew Laming's optimistic view, according to NBN