Honestly, I'm seeing this mentality a LOT from the raiders I know that used to hardcore progression. Even now, I know some guilds that are waiting to really push Jaina, as they expect a week or two before the next major patch Blizz will blanket-nerf the boss to "help" people get their CE achievements. With respect to Crucible, these same people are of the mind that CE for Crucible will still be available until the end of the Azshara raid, so why both pushing hard now since you'll basically get gear catch-up (and Essences) to make it super easy later? Of all my friends that have quit WoW that were former hardcore progression people, they've just grown frustrated that it feels like every raid/patch cycle is like what the transition of Classic -> BC felt like: everything you worked for was immediately trivial to meaningless.
Do I feel this way? Yes and no, I'm more frustrated with that much of the harder mythic raiding content is tuned to "one person screws up, it's not recoverable or worth trying to recover," as well as some other technical aspects of raiding in general. However, I've found it MUCH harder to recruit nowadays, because of the mentality described above, where the effort feels pointless much faster in today's WoW.