This is nothing more than an untested theory, but In 5.2 they will be implementing the changes to bags
The change is still in for the failbags to ... not be fail. They'll have a chance to contain things like very valuable grey items (essentially randomizing the gold you get from the bags), LFR versions of non-boss loot, Spirit of Harmony, consumables, pets and mounts, and... maybe some other stuff I forgot. Lots of things! Opening them should have some anticipation and surprise now.
I am not sure but is it possible to bank your fail bags and open them all up for 5.2? I'm not 100% sure if loot is decided when you open the bag or when it drops, but it may be worth holding onto!