I have looked, and can't seem to find any mention of any unrealized attraction concepts that were designed for DCA.
There surely must be some out there, since the park was underbuilt, but even Jim Hill hasn't dug up anything yet, from what I've seen. I realize this was the low cost alternative to Westcot, but there is always more designed than is actually built.
I am sure there are many out there who would appreciate hearing about any ideas that were kicked around for this park. I would like to hear about original ideas and not just attractions lifted from one of the other parks.
Clearly these Pixar attractions were an afterthought, and never intended to be part of the park. So there must be unused concepts floating about that are actually themed to your wonderful state of California.
Just because, "California Adventure sucks," as it seems, doesn't mean that there isn't/wasn't a very broad range of attraction ideas that could work within the original theme. The park clearly takes influences from MGM, Epcot, and Animal Kingdom, as well as various resorts on the Disney World property which have met with much success. But I don't want to get into the merits of the concept in this thread.
Thanks for any information you might pass on.