The author seems to be mixing two concerns into one - the innovation in infrastructure and the innovation in products.
While a breakthrough in infrastructure seems less likely( the hardware and the infrastructure of the information systems have stabilized at this point) there are more products and niches where addition of information processing capacity will lead to innovative results. In that sense the comparison of silicon valley to auto industry does not seem to be justified. Auto industry is producing a well defined product, while modern SV allows application of a commodity across all industries, just like electricity. Current generation of electric cars are as innovative as steam engines during industrial revolution.