First, my definition of nowhere: "Did not go viral as it may have been expected. Did not sale as much".
I thought it might be fun to discuss some things that at some point seemed like a good idea, but have not exactly taken off like others do. Feel free to list whatever you think falls into this category.
* 3D TV/Cell phones.
The idea of having to wear special glasses to watch tv was personally one of the off-putting thigs about this whole idea.
* 3D Cell Phone
I remember at least one manufacturer (HTC) that put out a 3D phone with an awkward toggle switch for the 3D functionality. Where did it go?
* Wearable technology.
Where did google glasses (or watever it was called) go?
I know (1) person who owns a samsung smartwatch... and 0 who own an apple watch... Compare that to the # of people who own cell phones
I think fitbit and the like are almost an exception to these, and a bit more popular due to the fact that smart watches try to do too much in such a small form factor
* Portable projectors for your phone.
I remember at some point watching a TV ad for one of these things... Have yet to see anyone using one of these things.
* Virtual Reality.
This has been attempted in different areas, most recently IIRC, under the term "Augmented Reality" on mobile devices. Does not seem to be doing too well.
* 3D Printing.
It may be a bit early for this one, but i'm going to go out on a limb here and say, not too many people interested on this stuff.