Weekly restrictions may have a lot to do with that. I got my drop on Tuesday myself. Haven't been back in all week because of it.
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I bet you this is all because of ninja's mudra change...
Yeah, you may be right.
But for some reasons, that average wait time changes. From 17m to 5m to 20m and so on. It can't happen on itself, right? Means that somebody gets in eventually. And they can't do it without healers. So some healers do get in.
Meanwhile, went to sleep and woke up...
http://i.imgur.com/nlBIjpL.jpg
And now I know that after 999:59 the Duty Finder halts completely. Yay.
What? Questioning sanity? They went to bed, it says so. They weren't waiting there 15 hours watching, they simply left the Duty Finder running and came back later to see if it'd still be up. It was.
My FC and I kinda figured it still wasn't working correctly when we queued for Lv50 roulette as Tank, Heal and 1 DPS and it didn't pop for around 15mins. Dropped, requeued, instant pop. I mean I suppose it could be a coincidence. But, it's kinda strange to have it pop instantly after requeue after that long.