If you compare this to the 5.1 part of 6000 valor points, you can expect the majority of people who started pre-5.3 to have it, 5.4 is not scheduled for atleast another 3 months. Also keep in mind that the 6000 valor required you to either do daily quests or 5mans in order to get the valor points, where here you just need to kill 6 bosses each week.
So far i have 2 and killed 6 bosses, and of course some people are going to be unlucky, but we have people who haven't even completed the first part of it yet.
You have ATLEAST 12 weeks to complete it, and yes, just to clarify to everyone, this is a way to keep you subscribed.