The big advantage of ufog is that it provides many of the advantages of nanotech while exposing one to fewer hazards than a solution in which general-purpose assemblers are ubiquitous.
However, it also looks like ufog is pretty hazardous by itself. Think of the lung disease that could be caused by misprogrammed ufog.
Also, the value would then shift from the material to the intellectual
Intellectual property however, can be cheap.