My gut feeling is that YoshiP and his team made their point with Alex Savage (A4S), and won't be pushing groups this hard again. I think they just wanted to prove for once they could make something that the best of the best could wreck their way through in 1-2 weeks and laugh about it. There will still be a savage mode for The Second Phase of Alexander, but I'm going to wager they either tone it down on the later floors or add in maybe a middle tier difficulty like a Hard Mode or Extreme. Savage should only be cleared by a select few, Babby should be cleared by all, but there should be a middle ground tier as well to keep a good amount of us occupied and not feeling a sense of hopelessness. A3S seems doable at some point for a good chunk of people (especially with maybe a few more upgrades to gear), but at this rate if feels like we (majority of raid groups) will need 3.2 gear to clear A4S from what's been said of it.*
*Most people in my static aren't even i200 yet (I'm 193 I think...), and I forgot that in both SCoB/FCoB, the huge difference in difficulty between doing the stuff (specifically T9/T12/T13) in progression gear at the lower end of the ilvl spectrum vs being near max ilvl. Once people are closer to i210, the fights might go more smoothly, but the fact the best groups are taking this long, with them having better and better gear with each passing week, makes me think this time around higher ilvl/gear isn't going to be enough to push as many groups over the edge like before in SCoB/FCoB.
Edit: This is what WoW does, right? They have multiple difficulty tiers for raid content. Did people like it? Was it viewed as successful?