Cohen says:

Open-source code is generally great code, not requiring much support. So open-source companies that rely on support and service alone are not long for this world. The traditional open-source business model that relies solely on support and service revenue streams is failing to meet the expectations of investors.

The whole point is to have a model producing great code. As these open source companies try to be everything to everyone, they eventually hit the same issue as proprietary companies: Bloatware. The software starts to suck and the users abandon the ship for another product which seems to do the same job better.