Subdermal motor nerve interface
Okay so everything below is purely hypothetical, but it would be really awesome if possible.
Maybe, just maybe, I'm trying to find a solution to a problem that doesn't exist, but still, you have to admit that having a neural interface would be really cool. So, oviously we're not getting something like in movies anytime soon, but there might just be a "simple" alternative
Imagine having an implanted logic chip, with a tiny coil for wireless power transfer (like RF/NFC chips) connected to a peripheral motor nerve (something like the ulnar nerve in the palm). This chip would be able to send and receive data, just like said NFC chips, but this data would be used to a) measure voltage in the nerve to provide output and b) stimulate the nerve by applying voltage to provide input.
This would be a very crude and simple version of a neural interface, but also a version that could potentially be done in this decade.
In short - by simply moving your fingers, you would be able to provide computer input, and also receive feedback.
Making the electrode out of conventional conductors would probably not be a good idea, but using an elastic conductive polymer (such as PEDOT-PSS) might work just fine
The circuitry would have to be small enough to not be too invasive but this has already been achieved in nfc.
Also, this would require a proper surgery, doing this at home would be really dangerous.
I can't honestly think of many practical applications this would have, but I'm sure they are there.
On the other hand, the same feature could probably be achieved by using non-invasive superficial electrodes, which doesn't need surgery and makes this kind of obsolete.
What do you people think?