RE: The Use of Nanobot; An extension of technology in the medical field

"The American society of mechanical engineers believed that nanotechnology will leave virtually no aspect of life untouched and is expected to be in widespread use by 2020."

I imagine that you meant another date, because it is already 2020, and although a lot of progress has been made, even in nanotechnology it is still far from being able to solve all these problems you are talking about. It's an interesting area of scientific development, and I also think it will be of benefit later on.