Sorry but I don't see why the 204 mainhand would be any problem.
I can't say for everyone but I myself, as a progression raider, do raids for progression and achievements, not to get the most powerful gears in-game. Everyone need better gears for progression, yes, but that's it. Unless we need the gears pretty badly that we wouldn't be able to progress without them, I'm fine. (still wearing many 192 pieces when we downed Revan)
So... I can say I didn't do Revan for 198 MH, not primarily. I did it for the achievement, for self-esteem and such. To be able to claim that we have done it and we're good enough to do it. The joy when we successfully achieved it. In my PoV those are the actual rewards, the MH is just a give-away for the achievement. If someones would skip Revan and get their 204 MHs from the new boss, then it's fine. And why not? If they had not done Revan they still had not done it.
Anyway, don't get me wrong. I do want that 204 MH like everyone does. But I'll be just fine with or without it as long as I and my raid team can do what we do. In the end, achievements speak louder than gears.