Adcoms are composed of human beings, and are largely composed of a pretty homogeneous group (well educated; physicians and PhDs and Deans at academic medical facilities). And we have a pretty good idea of their ultimate mission -- to put together a "good fit" class of highly qualified individuals. So one could put together a profile of them and guestimate their probably actions much like the FBI does when tracking serial killers. However you would need some algorithm of what constitutes a "good fit" for each particular school (eg. X% scientists, Y% nontrads, Z% in state, W% URM, etc), a sense of the subjective personality decisions they are making regarding candidates (eg. John Smith is brilliant but too much of an introvert, so we are passing on him) and a sense of the range of credentials they are seeing in the applicant pool. And then you would need to take into account that there are many variations of personality on each adcom, homogeneity notwithstanding. So it would be conceivable to understand and even predict adcoms, but would probably take a team of psychologists and a pretty good mainframe computer devoted to the task.
But imagine the money you could make from SDN'ers if you assembled such a team and could give people realistic answers to the persistent "what are my chances" questions.