Few things in American life have felt as trapped in the amber of history as Cracker Barrel restaurants, with their recipe of comfort food served up in cozy confines that evoke a bygone era. It's little wonder Americans routinely wait for an hour to get a table after church or welcome a road-trip diversion when they see the classic logo on a highway sign. Now, the cracker-jack whiz-kid marketing team at the iconic eatery's corprate headquarters has decided to forgo all of this, including...