An EEG is not the same thing as a "brain scan". An EEG is an analog point to point system which is very good at "reading" the parts of the generalized electrical field that reaches the scalp from the brain. Using EEG output to control stuff is a fun sideline which is almost exactly as old as EEG technology itself.
It doesn't work very well, and it very probably never will. The variance in electrical activity in the brain between two people receiving the same sensory input is, in an average way, too great to be useful.
Once someone comes up with a way to shrink an MRI machine to the size of a quarter that you just stick to your forehead and talks bluetooth to all your devices, then we'll be ok.