Perhaps the problem was is that originally the edutainment wasn't executed well enough. If it was re-Imagineered to something like a permanent selection of Food and Wine festival offerings, custom-built permanent pavillions for these types of offerings, then maybe it would work. I can definately see a stronger wine theme being successful, offering wine tasting after watching a re-worked Seasons of the Vine film.
Its also difficult to do things like this when the park has no real direction. It's a mess, how do cheap thrill rides and edutainment attractions work together? They don't, really. If the thrill rides were a form of edutainment as well, as they are at Epcot, then perhaps DCA could find its niche as per the Epcot model, but as it stands, DCA is too scattered and schizophrenic to really have a well-defined target audience.