Whenever people pull up that quote, they fail to focus on three key words -- "all the time." Hoke isn't saying that zone-blocking is pussy femball. He's saying that teams shouldn't solely practice zone blocking, because then the defense isn't prepared for a straight-ahead power running team.
Basically, he's saying that teams should be versatile. Saying that a team should be comfortable running from the I formation and with the quarterback under center is not the same as saying "abandon the shotgun!".