I'd like Shadow of Mhach to be the raid that proves that "status quo" doesn't have to mean "kill 'em all." I think between Crystal Tower and Heavensward, they've pretty much run out of heroic sacrifice cards to play, so hopefully Cait Sith will get a "see you next time" sort of resolution and not "goodbye forever." Mhach isn't Allag, after all, so there's no risk to the MSQ.
But not holding my breath.