It has been said that the layout of Disneyland is like a wagon wheel extending from the partner statue hub area into spokes like a wagon wheel but lately I have begun to think of it more like a pinwheel. The base or the stem is the long narrow Main St area, which feed the roots where the nutrients (guests) enter...
Once you reach the hub each spoke extends out but seemingly bends in a curved in perfect motion away from the pin wheel center. The only area that does not confirm to the model is the NOS/Critter Country area that seemingly floats on the end of the Adventureland spoke/Frontierland spoke.
To be honest I think the model is nearly perfect, I love it, opening up new paths or new lands would be nice but they would never "reinvent" the wheel so to speak, least not the pin wheel.
This my friends is the largest failure of DCA, less the theme and more the layout and I don't know if it can be corrected.
If Disney does consider a third gate I hope the study the design of the pin wheel/wagon formation and consider these elements when designing what ever it is they build.