It won't be long before Sequoia itself is overtaken by another. I'd say maybe 6-12 months, given how fast things change.
U know Will, nobody knows how fast or how capable human brain is, this is what nuroscience is all about, reason why we can't repair brain damage now is simply because we know too little about how human brain works, we have some ideas, and we know what some regions of brains do, but to compare human brain to a piece of machine is bit stupid tbh.
How fast is human brain, I have no idea, and I bet no one else does.
Just to illustrate my point, to post this took me only 1-2 minutes, but in that space my brain did well over 10 on 50 calculations. Just perception and vision took half of that.