Rather than making two short posts 3 minutes apart, you should consider the use of the "edit" and/or "multi-quote" functionality of these forums.
Originally Posted by Sydane
Remember, we aren't comparing Demo vs Destro, that's a different issue. It's mostly Metamorphosis vs Ruin (with a bit of Felguard vs Succubus thrown in). Ruin only outscaled UA in an Affliction build at the end of T6 (40/0/21 vs 41/xx/xx). 0/40/21 isn't even close to xx/41+x/xx, even at the very end of Sunwell. Yes, 0/21/40 outscaled them all, but that's a different issue that has been addressed. Also, destro itself didn't even beat out Affliction until the supplimental gear started accelerating people towards end T5 much faster. When S1/Kara/early T5 was what most people had, Affliction was by far the best dps spec, and it probably will be again at level 80.
The nice thing is that you'll pick up more than just Metamorphosis with a deep demo build, you'll gain a few other talent points worth having, meaning it doesn't have to compare directly to Ruin on a dps basis. Personally I think all the best builds we are seeing come out are deep in their trees and include the 51 point talent, and that's a very good thing and certainly what Blizzard intends.
Affliction was the best spec early when TBC came out for a couple of reasons:
1.) FSW hadn't been nerfed yet.
2.) Spell hit was not widely available on gear.
3.) Gemming for spell hit was impossible because veiled and great cuts did not exist.
From my understanding, it will be possible to be hit-capped at level 80 using current BT/Sunwell raiding gear. For this reason, I do not think Affliction will be nearly as dominant at level 80 as it was when we were all first hitting level 70.