Actually, ambient superconductors are by definition "nano structures" since they must be "unidimensional" (that has been shown theoretically by a number of people and there are experimental results including some unique carbon nanotubes and other unidimensional structures exhibiting ambient superconductivity.). As for the time frame, some initial small markets applications could be around within two years, but it will take a good 8 to 10 years before the impact will be of the type we often call "Disruptive technology". The market is not going to accept in general the risks associated with any new technology and adopt the technology without at least few years of "pioneers" breaking their teeth on such. Most of the companies that have "Nano" in their name may not be the one succeeding, though, they may not even be around. Which will, I know not.
Oh, mind you, CCMP slurries are already a first application of "nano technology", yet far from being "disruptive" for now, it is really what we call "Passive nanostructures" rather than active one which are yet to show up.