I think the biggest threat to the system is that they are not releasing it in a standalone patch. Instead, they are releasing it at the start of a treadmill reset. There looks to be some large amount of grinding coming in that will occupy a lot of the people who meet the requirements for a good while.

I myself tend to do a lot more helping at times like now, near the end of a patch cycle, and I notice others doing the same. So releasing it the start could have a "dead in the water" effect for it. Of course it could have an unitentional effect of more people who are casuals and not as focused (read: people who don't know class basics, not saying casuals are bad, but people who are so casual that they dont know their own class are bad.) having the time for the system at the start, inflating the ranks of people who will for example, say "A healers job is to heal, don't dps"