Has little to do with it. Bikeshops have little sway on extracting any frame out of the OE. RW explained the dynamic accurately I believe.
Specialized...I ordered a frame from them last year, is notorious for only providing updates and no solid commitment when a given frame would be available. In my case they beat expected delivery but many report that some frame orders fall into the black hole...again...I believe for the reasons RW explained...factory full bike builds and demand to justify a given production run of frames dictate timing.