What's interesting is that the 4 markets that the article listed have reached commodity status so we can infer that open source dominates once the market reache

What's interesting is that the 4 markets that the article listed have reached commodity status so we can infer that open source dominates once the market reaches the point that there is insufficient profit in the mass market for proprietary solutions to dominate. See the Java IDE market as another example. (If you are playing in the high end of the market and can bring something other than technology to the fight, quality, user experience, ease of use for example then proprietary can keep a foothold). So the question then becomes can the other layers become commoditized to the point that Open source wins out in those ?