The problem, however, is that we don't know exactly how many people it takes to hand out that debuff. Thunderbein tells the story of an AV where only 20 out of 40 players were actually playing, and so if the number of players that have to "vote" for the debuff is anywhere over 20, no one's getting the debuff in that BG. Hortus replies and says that it's not as high as 30, but how high is it? Can you give someone the with two people? With ten?
And then there's the question of whether we should know at all. What if we learned it was 10 people (in the interest of clarity, I should stress that we don't actually know what it is yet), and a group of 31 AFKers joined up to the BG? Then, nothing is solved at all-- those guys could sit in the Peace Cave all they wanted and gain honor the whole time.
The AFK debuff sounded like the best solution at BlizzCon, but every system can be gamed. Blizzard is going to have to be really careful about setting up the numbers on how the reporting works. And because we'll likely find out whether they tell us or not what the number is, they'll have to watch out for other ways AFK players can get around the punishment.