Back in Windows 3.1 days, I had written some software that used text-to-speech, for those who had lost the ability to speak. That brought me into online contact with others (quadriplegics, etc.) who needed computer assistance. I played around with a very early brain control system (from a company in Israel, IIRC) to move the mouse but never got it to work reliably either because it or my brain was inadequate.
It was individuals with specialized needs that also inspired Bill to create BVC.... and to look at "brain control".... which could be helpful to those who are speech impaired. I myself.... just love exploiting the technologies in the simplest ways possible. If it hadn't been for X10 (and BVC) I might have ended-up with a panel of doorbell buttons triggering relay switches, to achieve my Home Automation.
With the early systems... the slowness of the processors and bulkiness of computer language... made your efforts all but impossible. Great ideas almost always proceed the technology.
The recipients of a brain chip will probably have to take so many immune system suppressants that a finger splinter will probably result in your arm falling off. 
There have been countless thousands of RFID chips implanted as of today,
with no ill effects. True...
almost all are in dogs. But we have also implanted huge numbers of pacemakers and such in humans for
decades. The implant technology is sound. We do need better battery/energy use/storage solutions. Maybe radio wave battery charging. Or some sort of implanted battery/energy generator that uses an internal chemical reaction to make tiny amounts of battery storable electric... who knows.
I see huge potential in wearable technology (
like I would know... lol). Wearing clothing seems to have caught on. And carrying around technological devices like credit cards with chips and even cell phones seems to have become an acceptable practice. Google glass was maybe a little too early... but we'll get there.
I see (in my real life experience) everything is integrating. I can talk to my house (BVC controlled HA PC), I can talk to my (docked) iphone (Siri). I can talk to my TV using the microphone function of my streaming device. My computer, my phone, and now even my TV share [some of] the same functions and even the same cloud memory (and calendar events). I would NOT object to another device... that would complete the integration of me to my devices.
