I know it is a difficult concept to seize but let's try it slowly: R O T A T I O N.
What's the obstacle to 24 people from various guilds who banded together to do it again and rotate? In three weeks each member would do secret boss twice and even some guilds would step up this way to 16M ops for good.
It's the matter of succesful mindset to see opportunity where others see obstacles, that's why some will keep winning and some keep failing, easy as that.
They would still miss out of the excitement of the first kill. Not to knock rotating people, but it is quite a different experience being there for the first kill.