wut? I don't even know what to say, I don't see how you can go "well done LFR, cleared everything now"
H: Ragnaros: 6424 (9.57%)
H: Nefarian: 3560 (4.71%)
H: Cho'gall: 5336 (7.07%)
H: Sinestra: 2147 (2.84%)
H: Al'Akir: 3078 (4.08%)
H: The Lich King (25): 1101 (1.85%)
H: The Lich King (10): 5664 (6.71%)
nope
or at least highly unlikely
That's the worst logic I've ever seen. I will counter with this little bit of what you should consider: Every one of those fights listed received virtually no nerfs compared to the severity of the DS nerfs (Even the ICC nerf wasn't as bad, since the DS nerf actually reduces the damage the mobs do too). More importantly, you're overlooking one important fact...
All of those fights are vastly more difficult than anything in Dragon Soul. Spine was a challenging fight 8 months ago, but it has been nerfed twice as hard as every other fight, the only reason it's still challenging is getting your tank to kite. That's it. Rag was nerfed substantially enough (and is counting 10 AND 25 where 10 is a joke) to also have a high stat even though nobody goes back except for mounts. The rest people have little incentive to go back and do, and were basically never nerfed except through gear. If anything, I think your stats show that they should be encouraging people to continue to pursue old content because it's not being used, rather than invalidating it. Dragon Soul has high completion because it's easy, it's the last tier, and there's nothing 'above' it for a year. The older content isn't completed because you get immediately shuffled into the next zone - completion or not. The gear curve makes finishing any prior tier in the xpac completely pointless for the vast majority of raiders.
Prime example of that right here. My raid's been chipping away at heroic DS for the last few months, just getting Spine down the week the 30% nerf went out (and we probably couldn't have done it at 25%, as close as we're cutting getting the first tendon down in one pass). If everyone in the raid had a top notch computer, a perfectly reliable internet connection, and the time to gear up alts to switch out fight-by-fight, it probably wouldn't have taken quite so long. But we don't, so progression has been slow and steady and we'll probably drop Madness just before 5.0 hits, a position we would absolutely not be in without the nerfs.
Except you can't know that, you never will. The nerfs obviously make the fights easier, but it's insane to say that people would never beat a boss if they didn't get nerfed.
You're claiming you'd never get spine because you almost don't get the first tendon down in one pass?! That's a post-nerf feat, you couldn't have done that anyway before. We can't do that (well, probably CAN now, but certainly don't) on 25, on 10 it happens but that's not like the standard strat. What that tells me is your dps is MOOOORE than fine, by a lot, and you're simply still (gasp) learning the fight! The same roadblocks would be there before and your dps would still be plenty sufficient.
Re: Grimace (didn't bother to quote) People that can't make inroads into heroic without a 30% nerf probably would still be 'progressing' on normal if the nerfs don't exist, or would be progressing on heroics and be a couple bosses back, is that a bad thing? Is it really? Is it much better for 20% of ALL GUILDS to have nothing to fucking do for a large part of the year instead? that's an awful metric imo.