Again, think of industries that will grow the economy in new ways.  Computers and the internet drove growth since the 80s.  Those two developments disintermediated the value chain, allowing companies to free up back office duties and making the link between manufacturer and consumer more direct.  The growth in the 2000's was a shell game.  Financial innovation will only get you so far.  Real estate--while creating weath and some temporary jobs--wasn't a real growth driver.  It was a wealth transfer and a temporary job creator.  Eventually, you run out of population that needs homes and businesses that need space.
What I'm talking about is something revolutionary.  We need to produce something in this country again.  We can't just be a service society.  "Green jobs" are a scam.  So, what's next?  Crap like wind, solar, blah, blah, blah may make our environment cleaner, but do we need more energy?  Not so much that it can't be satisfied with coal and natural gas--which we have in abundance.  We need "the next thing" the way computers transitioned us from heavy industry.  I don't know what that "next thing" is.