This post is a bit confusing. At first glance his post appears to be directed at the Rails framework itself. Reading further, he seems to be referring to the overall ecosystem rather than Rails itself.

That seems about right to me. The trunk and the major branches of the tree are generally solid. Minor branches and the leaves of the tree, not so much. I think the pace of the community creates a lot of leaves and minor branches. Anything really important will mature into a major branch and become solid.