People also expected the iPod, iPhone and iPad to be the next Newton. You're sounding like a broken record.
To be fair, there were obvious and good uses for those products.
People wanted to have music to take around with them and always have done since transistor radios then walkmans
People have wanted to have a communications device, and if it can also play music and take photo's even better.
People have for years been dreaming of tablet thin computers, having been shown off in Sci Fi films for decades, something small, thin and light to do things on that are too hard to do on a tiny screen.
With the watch, people have spend the last couple of decades getting rid of them, and stopping wearing them, as they now carry the phone which makes the watch redundant for many.
Other than it not being on your wrist, the phone does everything a watch can do and a million other things.
Not only that, you pretty much still need to carry the phone to use the watch.
Unlike the others it's not it's own product, just an accessory.
Whilst I'm sure it will sell to many, it's not such a MUST HAVE device as the others.