I bought the LG 920 Optimus 3D phone some years ago. Awesome 3D screen, 2 x HD cameras for taking 3D photos. Fun for 14 days, after that...it just became an annoyingly big bulgy battery guzzling smartphone just like any other oversized phone out there.
3D TV? I so wanted them when they came out. After a while with very little use for them I thought Meh... and after an even longer while, the 3D tv sets went for a few hundred dollars, even in 50" sizes. I still thought...Meh...I'll stick to my old 47" LG full HD tv.
Same thing with Kinect, fun the first few days, fun to also connect it to the PC and play with all the hacks out there....same issue, technically useless stuff, fun...for a little while, but ultimately useless.
3D scanners? Meh... it'll probably be another fad, scan your objects, watch them on a 3D screen kind of like my Optimus 3D phone or the Nintendo 3DS...novelty item at best.