a question on nanotechnology

[Charles Carter]

I wonder if nanotechnology research is a giant waste of time.  Couldn't 
making customized enzymes (abzymes etc) perform the same functions as a 
nanoscopic 'machine' with moving parts?  Once we unravel the connection 
between protein structure/sequence/function, enzymes could be computer 
designed to build macromolecular structures, carry out in-vivo repairs 
etc..  And this goal is only a decade or two (not a century or two) away.
  
Chuck