Heinlein also predicted waterbeds. Although he was postulated them as acceleration couches for multiple-g acceleration rockets.
Predicting the future is a thankless task. Isaac Asimov noted that in the years before 1969, there were zillions of SF stories predicting the first manned landing on the Moon.
Not a single one predicted that when it happened, most of the world would be watching it live on television.
I talk about this a little on my
website.