How long has Cable been the OL coach & exactly what has been his results?
The OL hasn't ever been even close to half assed good since Cable has been here, It's like he is untouchable because he is so great of a coach, but the results of his efforts are and have been unacceptable. Why give him a pass and blame everyone else? Sure the Super bowl appearances and division titles came under his watch, but IMO that success was in no way because of Cables good coaching but in spite of it.
If I had an employee that wasn't at least "average" in his abilities to do his job I would easily come to the conclusion that I need to replace that employee. CABLE HAS TO GO, because his coaching hasn't even been league average and things will not change until Cable is replaced by a more competent coach that can actually improve the OL's performance. The zone blocking crap that Cable is supposed to be a guru of isn't working out, is too much of a finesse style of play. If the team wants to be the bullies of the NFL again, IMO they need to load up on big, mean, nasty power scheme blockers and pound the heck out of the other team. They need to block the body, not fall on the ground trying to cut block below the knees and then watch the DT's, DE's & LB's fly by and disrupt the play or kill your QB.