This is a futuristic pipe dream IMHO. Integration of electronic interface to human neurology...... is farther away than "3 or 4 years"
It is defiantly NOT a pipe dream... many new devices are aiding the otherwise disabled today... some military vets.
How long will it take to get from here to there.... is anybody's guess. Lots of time delaying government regulations have already been dismissed... along with the "medical device taxes" (thank God).
I used to work within sight of where the Wright-brothers built a barn for their Aeroplane (aka heavier than air aircraft). The barn and their catapult has been re-built now. I regularly ride my bicycle past two homes that were once owned by the brothers. The one they owned when they were making bicycles... still has the porch they added to the house. The brick paved street (not far from there) is the actual bricks that were there then too. I am sure... the Wright Brothers and I have ridden bicycles on the same bricks.
3 or 4 years... not likely! Historically speaking.... it will only take till tomorrow.