When the Tier 11 nerfs hit, I was annoyed. Just annoyed. I didn't think they were necessary. It was unprecedented. Prior to this, nerfs only happened at the end of the expansion cycle, and during the course of the expansion content self-nerfed with the advent of better gear.
I came to grips with the Tier 11 nerfs. Mainly because my raid group managed to successfully tackle Nefarian and reach 12/12 normal the week before they hit.
We raid on a relatively brief schedule: Twice a week for 2.5 hours at a time. In the last 11 weeks of Tier 12, we've achieved 4/7 status, with Alysrazor, Majordomo, and Ragnaros to go. Our slow progression has not been due to the difficulty of the encounters but rather to difficulty in finding and keeping a good offtank.
Tier 11 took us 4 months to complete. 16 weeks. In those 16 weeks we tackled all 12 normal mode bosses. It was slow at first, and we got a late start, but as our gear level rose progression accelerated and toward the end we found ourselves downing 1-2 new bosses a week, then it was Cho'gall after 2 weeks, Al'Akir after 2 weeks, then Nefarian after 4 weeks.
We've been at Tier 12 for 11 weeks. Our first 3 weeks we focused strongly on Heroic Tier 11 content to help us gear up, as we lacked the DPS for Beth'Tilac and Baleroc. During those weeks we would defeat Shannox and then go to Heroic Halfus, and Heroic Magmaw, ect.
Eventually, via Valor Points and defeating Shannox and Heroic modes, we reached the point where we finally had the output to survive Beth'Tilac. The following week, we toppled our Guild First Lord Rhyolith and Baleroc in the same lockout.
Then disaster struck, and offtank trouble began anew. Recruiting a new offtank last week, we geared him up in Tier 11 on our first raid night, and proceeded to get 2/7 on our second raid night.
This week we planned to go back to Alys and resume progression.
Only to be greeted by the news that effective next week, the content is going to be nerfed.
I remember how drastically you nerfed Tier 11. It was horrible. Reasonably challenging encounters became utter faceroll for us. It wasn't even fun anymore.
Please, don't do that to Firelands. We aren't ready for that. We're here for the challenge, so don't take the challenge away. Just because the screaming masses grew up playing video games with their Game Genies for invincibility and unlimited lives and are demanding easy content, doesn't mean you should cave in to it. The teeming hordes of casuals want 5-man content. Nerfing Tier 12 isn't going to motivate them to form 10-man groups.
To quote the OP, and Ragnaros himself, it's simply "TOO SOON".