It’s been fast like that since the end of WWII.
My parents were born in the early 60s and they saw records replaced with eight tracks and then cassettes and then CDs and then mp3s and now streaming.
Answering machines were a novelty when my parents were children and now we have cell phones.
The internet wasn’t even something you could have imagined in your wildest dreams in the 1970s.
Some people did imagine it in the late 60s or early 70s… The first remote connection to a digital computer was at Dartmouth College in 1940, first commercial modem 1950, and Dartmouth time share system in the 1960s. Your statement is correct, though I definitely couldn’t have imagined it, but thankfully, some people did.