Kind of goes hand in hand, gotta have the horses to run the more exotic stuff. Right now, the Steeler D doesn't. However, I'd argue that passing games have so improved over the years that more and more teams are no longer afraid to attack it. It's been 4 years since the Steeler D forced bunches of turnovers and intimidated opponents. Ever since Warner figured out how to carve it up at the end of SBXLIII things really haven't been the same.
The main reason our pass D has been sucking is that we are not able to generate a consistent pass rush. Last year before his injury when Woodley was beasting our defense looked great. As soon as he got hurt everything went to shit. Unlike the Giants our pass rush comes entirely from Woodley and Harrison, if that is not working we have to dial up blitzes but those don't usually work against vet qb's unless used very sparingly and have to be set up by the D stopping something the offense is doing.
Even against the Cards Warner was not doing shit for 1.9 quarters until the Cards adjusted to Harrison and gave the LT some help (and the refs let him hold like a mofo). Once he was taken out of the game Warner was not worried about the rush and he picked our 2ndary apart.
Now that defenses cannot deliver huge hits to the qb it is difficult to intimidate them. The only way to counteract that is to either just have a shitton of talent on D the way the Niners do or to create a great pass rush the way the Giants have. You kind of have to suck for a long time to build up the talent the way the Niners have so to me it seems like the way to move forward right now against these pass whacky offenses is to copy the Giants. The Steelers D tries to be too balanced but I think you have to give up good LBs (not like we have those anyways) and put the majority of your draft into the line. I feel like the 4-3 generates a more consistent pass rush anyways so that seems to be an advantage in today's NFL as well.
And as far a LeBeau's calls, offenses never seem to be prepared for his blitzes but as long as he is coaching up the players from Monday to Saturday (not sure he is) I think we overstate the importance of the game calls on Sunday. Like you said, when you have a bunch of pro-bowlers on defense whatever you call is pretty much going to work.
Since we can't draft good talent in the middle of the season unless 2008 Harrison comes back to life in 2 weeks I think we have to make some serious adjustments to how we play defense. We are going to have ditch the zone and start playing more man to man and take more chances on defense. Sitting back with your ass cheeks spread wide open doesn't seem to work on the offenses we have played against so far. It stopped Sanchez, but unfortunately not every qb is that bad.