At first, paralyzed folks will be able to communicate poorly, then better and better. Then they'll be able to control robotic arms very well. As this is going on, the links to thought processes and senses will become more and more nuanced. Blind people may very well be able to walk down busy streets, their eyes being one or two cameras hooked to the internet or the brain interface. More interesting stuff happens...
Then, in about 20 years, every kid will be able to talk to every other kid in class, and it'll be impossible to keep kids from cheating on tests. 3D worlds will become completely immersive, kind of like Lisa Simpson's kid. But society will probably have broken down about then.