Re: We have the technology
The brain interface part is the only essential new element. You can do the rest with a camera mounted on a headband and a wearable computer. It's just the brain interface is really hard to engineer.
The only convenience nature has given us in that task is that the visual cortex is easily accessible to surgeons. Once a suitable device makes it out of the laboratory and into regular the use, the actual installation is practically a routine procedure already. Just remove a section of skull at the back, carefully pull aside a membrane, and there's your target ready for probing. It's not entirely safe, but it's as safe as neurosurgery gets.