Sort of . . .  They are only just getting started.

 

We are at the same point now as Charles Babbage in the 1800's trying to build digital computers.  He knew what it had to do, but could not come up with a practical way to build it.  And a lot of the stuff that they are proposing is the equivalent of a modern laptop.  The fibers we might start seeing in 20 years, bu some items will probably not exist within this century.

 

The simple part will probably be developing the nano assemblers and replicators.  Figuring out how to program them (remember, we will have to individually program over a million machines per cubic millimeter) will be the real trick.