Cata replaced the daily Heroic dungeon reward with a "7 rewards per week" reward system. What happened to that?

In patch 4.3, Blizzard replaced the daily reward system to one that would give you 7 rewards in a week. This meant that you'd get the same amount of rewards per week, but if you had a full day of free time to play followed by a week of work, you could still earn a lot of the weekly rewards. It was more flexible. What ever happened to that system? It's currently back at the 1 reward per day, why was the 7 rewards per week system removed?