Sure. Problem is nobody knows how the brain actually works. The Brain is the last great unexplored territory of inner space. We know the basics - like nerve impulses run through the brain. We also know that certain parts of the brain fire when we think of jelly beans, and other parts of the brain fire when we actually eat jelly beans and we think that both fire when we dream of eating jelly beans - but then other parts of the brain are firing as well. No two human brains work exactly the same. Computers pretty much run in a linear - one path method. The human brain runs in a non-linear millions, billions, trillions path method. Thus two people could have the same exact thought, but the path that that thought would fire in those two brains would be vastly different. We are only now being able to send "simple" signals to the brain along the optic nerve and through the inductive nerves for hearing. We have only cobbled together a crude device that can actively pick up brain patterns and convert that into digital data and "do stuff" like the man who recently hooked in to a robot arm - however he is learning how to use the hardware, the hardware isn't able to send signals to him to control his thoughts. At the rate technology is going yes we most likely would have the computing power and the nano-tech in the next 50 years to make the machine. At the rate we are learning about the human brain we are looking at hundreds of years before we could synth dreams in this manner.