Gordon is an excellent; reading his book now which is a great read. But his theoretical framework is weak. He does not have a theory of growth or of the direction of innovation such as by a Aghion or Aghion.
Is much easier to make the argument that innovation is getting harder simply by putting for the massive increase in the size of the research and development labour force and of graduates and yet no increase in the growth rate.
A fab paper by Robert Gordon of Northwestern Univ. I cannot locate a free version.
He looks at the US growth story from the innovation cycle angle. He points to three phases of innovations in US. Each of these phases led to growth in US economy. Some innovations had a much larger and longer impact than others.
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Utopia, you are standing in it! 
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