So there is a lot of research ongoing with neutral interfaces but one obstacle that every experiment is running into is that nobody's brain is the same. Much like fingerprints you can know where a specific feature probably is but the individual pattern of neurons is fully unique. X Input in Y location might make one person taste a roast beef sandwich, another may smell a grape, and a third might have a seizure. Suffice to say any neutral interfaces will need to be individually calibrated for it's user and I don't see broad market experiences using such technology until such implants are universal. I think the system in Ready Player One where you just use advanced haptics and rigs that allow for full movement is far more plausible in our lifetimes.