The largest obstacle for me to adopt such a system is that it requires me to bet my company's content on your system being around. I've looked at, for example, Webpop which is different but has some similar ideas - but I can't get away from the fact that Webpop may or may not be around in a year, so betting on it isn't something I would want to do.
That's what continues to push me to Wordpress and the like, although recently I've been spending more time with static web generators like Harp and DocPad. Those have a similar issue - my boss saying to me "Well, I know we can find Wordpress developers, but will wevbe able to find a Harp developer?"