I don't understand this.
The time of the modem was somewhere between 1995 and 2000. Only 5 years. Before that, nobody had Internet access. (Except at work, and a few, just a few people might have had dialin access at home. I think commercial ISPs started in 1989 to sell connectivity to corporations. And in 1993 or so, the first ISPs started to sell connectivity to individuals). After 2000 everyone switched to cable and DSL. So we're really talking about a 5 year period here.
The real thing that should blow kids away is when they realize how hard it was to get information *before* the Internet. Before 1995. Or before 1993 if you were an early-adapter.
You wanted to know something about something you learned in class ? Go to the library. It was the only place where you could find such information. Oh, and the library was only open between 9:00 and 17:00. And if you lived in a small village, there might not have been a library.
You saw something on TV ? Wanna look at it again ? You heard about a movie or series, and wanna watch it ? No way. Wait until it get re-broadcasted. Most stuff never gets a rerun. What you saw on TV was then and there. And when it was over, it was gone. Forever. (Later you could rent a video. But most videorentals would have a limited number of films, only the most popular ones).
Heard a song you like ? Go to the record-store to buy a record. Maybe it was an older record, or something out of the top-100 ? Tough luck, the record might have been sold out, and not reprinted. CDs were not much different.
Want to take money out of your bank-account ? You gotta go to the bank. No ATMs. No online banking. Oh, and in my country, banks would be open only between 10:00 and 16:00. I remember when I got my first real job, I couldn't get my money, because I had to work until 17:30 every day.
Wanna talk to someone in another country ? Phone-calls were just too expensive, most parents wouldn't allow it (multiple dollars per minute for calls across an ocean). The only practical option: send a letter. And letters would take a week or more to arrive.
And these are just the obvious examples. There are so many things that have completely changed since the arrival of the Internet. Most people (young or old) aren't even aware of it anymore.
Who cares about slow 56k access ?
The real shocker is the different between Internet and no Internet.