Again, some of this is probably "our", ie. pathologists', own fault. Given the choice of teaching and not teaching med students, residents, etc, pathologists probably lean towards not teaching. And so, specialties that have a stake in producing new, outstanding talent win out (surgeons, obgyns, cardiologists, etc); whereas we're on here bitchin' about the job market and the erosion of our specialty. It all comes down to marketing and selling your-(our-)self.
Pathology is disappearing from the curriculum because there are fewer and fewer advocates for our specialty to push back against "the system" that is reducing medical education to a series of clinical vignettes. You would think that's a good thing, because that should restore us (pathologists) as the doctor's doctors, giving our expertise to help interpret lab and histo results for other physicians. Alas, if they don't know who we are, isn't it much easier for them to defer to the pretty report, with explanation and references, that they get from Mayo, Quest, Ameripath, etc?