Are the Days of Zone-Blocking all but over ?

[Warren]

Zone blocking worked when defensive tackles were big fat guys and linebackers didn't run like safeties. In a bigger, faster, more aggressive NFL, zone blocking may be as meaningful as a Brett Favre retirement

That's just wrong. Zone blocking was designed specifically to counter increased movement and stunting by defenses. In a ZBS each blocker is responsible for a particular zone, rather than a particular defender, so the blockers don't have to worry about what to do if their guy does something like shift before the snap, twist, or drop into coverage – the OL have their progression to work through. And unless you’ve got the athletes on the OL to handle these bigger, faster defenders straight up, you’re going to need to use leverage and technique to do it… like with a ZBS.