The cracks are starting to appear in the Bitcoin façade – from audacious multi-billion pound heists, to increasing government intervention, and the ever-present danger of it being a currency more volatile than one of Walter White's 'special' chemistry experiments. The Bitcoin crypto-currency dream doesn't seem to be all it was cracked up to be.
But Bitcoin isn't the only tech dream that's falling flat. Here are seven more Silicon Valley poster-children that aren't quite the technological Second Coming.
1. Crowd Funding
Kickstarter was the solution for uni students with a back-of-the-napkin idea and an overdraft the world over – put your amazing idea up online, and strangers will pledge a bit of cash to get your genius plan into fruition. And, to a small extent, it's still alive.
However, Kickstarter's Greatest Hits isn't such a smash album at the moment: Pebble, the biggest project to date, delivered on its promises nearly a year late, and is probably about to be smashed by the tech big boys' smartwatches. Ouya, the cheapo Android gaming consoles, is now less of a household name than HD-DVD. Oculus Rift, the awesome-looking virtual reality headset, has been bought out by Facebook, so that'll probably end in tears (and an incredibly realistic version of Farmville).
2. E-Readers
Amazon's £59 Kindle might be all the rage at the moment, but e-readers are almost certainly doomed to obsolescence in the next decade. Tablets have been getting real cheap – the first iPad cost about £350 at launch, four years ago; now, you can buy a Tesco Hudl tablet, which is an all-round better tablet than Apple's first machine, for £119.
With that kind of cheap pricing, more people will be buying tablets, and no-one needs two devices. Sure, e-readers have screens you can read on the beach and better battery life, but given a few years tablet technology will catch up -- and then it'll be game over for the Kindle and all its e-reader pals.
3. Motion-Gesture Controls
If you've seen Minority Report, you'll have noticed that the guy messing around with the hi-tech gesture-controlled computer isn't your stereotypical computer nerd – rather, it's Tom Cruise, at the peak of his physical prowess. That isn't by accident – it's because controlling a computer by waving your hands around is actually incredibly tiring, and far harder work than simply using a keyboard and mouse, like most good civil servants.
In fact, despite the fact that you can buy a motion-control box for a computer for about £50, elaborate hand signals to control your desktop haven't caught on. The simple reason being that Old Faithful, the keyboard and mouse combo, is incredibly precise and low effort. And you know the saying – if it ain't broke, don't fix it. It's difficult to see any input system – and particularly not anything that involves flailing like a maniac – taking over your spreadsheet input duties any time soon.
4. 8K TVs
5. 3-D Printing
Another poster-child of the modern age, 3-D printing is meant to revolutionise the way we buy stuff. Rather than ordering something on Amazon, or, god forbid, going to an actual shop, the lucky citizens of the future will be able to use a 3-D printer to make their own versions of everything, from shoes to smartphones and your lunchtime can of Pringles.
Only, it's not that simple. 3D printing, while a useful industrial tool for making prototypes relatively cheaply and quickly, is nowhere near being useful for actual consumers. They're really not all that user-friendly: even if you could print all the insanely complicated parts that go into making a phone – or, heck, even a pair of trainers – you still need a fairly skilled worker to put them together. It's certainly no easier than clicking buy it now or taking a stroll to the shops.
What's more, 3-D printing is (and, in all likelihood, always will be) more expensive than just making a mould for mass production. 3-D printing has a niche, for sure – it's just that niche will always be stuff like making custom dentures or footbeds for the discerning consumer, not a new car.
6. GIFs
The concept of GIFs – a tiny nugget of video that auto-plays in a browser – certainly isn't new, and probably isn't going anywhere soon. However, the actual Graphics Interchange Format, first coined in 1987, is getting a little long in the tooth, and wide around the middle. GIF images are just too big for many computers to handle easily, rendering hundreds of Buzzfeed posts and Tumblr blogs incomprehensible (if a little easier on the eyes).
HTML5 video, on the other hand, provides tiny, stutter-free files that lets your computer just fly through all those clips of dogs running into windows. Give it a few years, and the GIF will be nothing but a particularly nasty Trivial Pursuit question.
7. Delivery Drones
If Amazon is to be believed, the future of buying stuff on the internet involves millions of autonomous drones flitting around, bringing HDMI cables and knock-off phone cases to the masses.
Obviously, though, this is never going to work. Never mind the fact that creating armies of delivery drones is setting Skynet up for victory further down the road, but it also sounds a darn sight more expensive than equipping a postman with a bike and a sturdy pair of shorts.
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