Yes, the JCR spec is not easy to implement. But with a mature implementation, you can create your CMS convention driven. Those conventions can be as narrow as you need for a simple CMS. And when you want offer more, you are not limited by the content repository but only by your conventions, which you can widen at any time. I hope, more people will look to JCR as an option, because it solves the content repository problem very well.
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Yes, the JCR spec is not easy to implement. But with a mature implementation, you can create your CMS convention driven. Those conventions can be as narrow as you need for a simple CMS. And when you want offer more, you are not limited by the content repository but only by your conventions, which you can widen at any time. I hope, more people will look to JCR as an option, because it solves the content repository problem very well.