Alright, you guys are probably getting as tired of Tank Time/Call To Arms as me, so hopefully this will be the last post on the subject for a while.
Maybe this Call To Arms issue is showing us the upper limit of difficulty for transient content.
Maybe transient content can only be so difficult before we start seeing problems in the system, such as lack of critical roles. I know I complained that rifts in RIFT are nothing more than zergs, with no skill or strategy involved. But perhaps that's the way it has to be. It's entirely possible that if those pieces of transient content were too difficult, the system would break down. Arguably, that's what happened with Warhammer Online Public Quests, they got too difficult unless you had the numbers.
Perhaps Blizzard would be better off saying: here's easy content, and here's hard content. You get a Dungeon Finder for the easy content, but anything difficult requires you to build your own groups. Maybe difficult content needs to be reserved for extended forms of play, such as raiding, where you are involved with the same group over multiple days.
Or if the 5-mans are hard enough, it might would be better to leave them off the Dungeon Finder, signalling to the playerbase that you need to find your own groups, or that you should be doing them in-guild. But even long Dungeon Finder queues might be preferable to that alternative.
Again, a lot of qualifiers for this idea. It might be completely wrong, and we are still well below the "difficulty ceiling" for transient content. I think the real test of this proposition is coming in 4.1. By all accounts, the new troll instances are harder than the current heroics. So they will stress the automatic group creation system even more.