Atomic positioners will only be used to make things that could not be made in any other way. There isn't going to be a nano-utopia. With nanotechnology we can build apparatus that will enable us to understand the phenomenon of quantum entanglement, and make use of it. This is the key to the door that leads to wonderland. All kinds of nanodevices could be built within cells.
Mesoscopic physics holds many surprises.
Biology has been the happening science in the last several years, but physics is going to reclaim its place in the sun. I want to say just a little about the form of the argument. In mathematics, one frequently uses inequalities. I may not know much about a certain function, but if I can prove that it grows faster than a linear function but more slowly than an exponential function, that's a step towards getting a handle on it. Mathematicians also map one structure onto another, perhaps from a different area of mathematics, and the mapping illuminates both areas.