Anyhow, the correct answer was that the Bitcoin market is too small for institutional traders to be bothered with it.
Too few is correct in this case, as it would require more bitcoins (not more decimal points) to bring the market to an acceptable size.
Let me reword the statement. More bitcoins are needed to bring the value of the market to an acceptable size. Trading in microbitcoins does not solve this problem. The article is correct in saying that there are currently "too few" bitcoins. It neglects to mention that there will always be "too few" at current prices, but regardless there is no error in the text.
There are too few flowing bitcoins because it is still excessively undervalued.