I remember when I first heard about DVDs and how much more data they could hold than CDs. I thought, 'Who would ever need that much space??'
A couple of fun things in this vain I've been a part of. God, back in the earlyish '90s, I was running a pizza shop in Ohio. I had a driver that was working 3 full-time jobs. All so he could buy the latest computer equipment the minute it hit the shelves. He came in all excited one day because the company he ordered from said he was such a great customer they were going to upgrade him for free from the single-speed hard drive he had ordered to the brand-new dual-speed.
When I was in college I took an independent study in new technologies (my major was Radio, TV, and theatre.) So this was back in 1986, and one of the "new" technologies was VCD, which was the video version of a regular CD-Rom. They were replacing 12' laser disks.
Notice how the original laser disc says side 2? That's right, halfway through the movie you had to flip the disc like a record. And speaking of records, when my youngest was about 9 or 10, she saw some of my old albums out and asked: "What are those big, black, round disc thingys for?" God I felt so old.