I don't know, Marian. It seems that the system has worked very well given few constants over many years. At present it is failing to produce. We're all observing a number of decrements, and they are interrelated. It is tempting to point to a single-point failure (for example, playcalling, Brady Decline, Mankins Departure/Other O-line insufficiency, whatever you want.)
Maybe you/somebody else can tell us how many new plays have been added to the offensive playbook over the years; "The system we stick to" was bombs away in 2007, dink and dunk in 2001, in between in 03 and o4, etc. At some point I heard something about zone blocking being added... serious question here, what are the common characteristics since Weiss' time that you mean by "the system"? I'm nobody's football genius, and more hoping to learn something than doubting you here.